Chullin Daf 126 (חולין דף קכ״ו)

📖 Breakdown

Amud Aleph (126a)

Segment 1

TYPE: שאלה

To which clause does Rabbi Yosei’s dissent apply? Not the latter one.

Hebrew/Aramaic:

וְתָנֵי עֲלַהּ: רַבִּי יוֹסֵי מְטַהֵר. אַהֵיָיא? אִילֵּימָא אַסֵּיפָא – תַּנָּא קַמָּא נָמֵי טַהוֹרֵי קָא מְטַהַר!

English Translation:

And it is taught with regard to that halakha in the mishna that Rabbi Yosei deems it pure. To which halakha in the mishna is this referring? If we say that it is referring to the latter clause of the mishna, which discusses a chest placed in the entrance of the house, the first tanna also deems it pure in that case.

קלאוד על הדף:

The daf opens by completing the chest-compartment sugya carried over from 125b. A baraita records that Rabbi Yosei declares the case pure, and the Gemara asks which clause he is addressing. It cannot be the latter clause — the chest standing in the doorway with its opening facing outward — because the first tanna already rules pure there, leaving Rabbi Yosei nothing to dissent from.

Key Terms:

• אַהֵיָיא (aheiya) = to which? — asking which clause a statement addresses
• אִילֵּימָא (ilaima) = if we say — introducing a possibility to be eliminated
• טַהוֹרֵי קָא מְטַהַר = he already rules pure

Segment 2

TYPE: תירוץ

Rabbi Yosei answers both grounds — and holds that hidden impurity does not break through.

Hebrew/Aramaic:

אֶלָּא, דְּקָאָמַר תַּנָּא קַמָּא: טוּמְאָה בְּתוֹכָהּ – הַבַּיִת טָמֵא, אִי מִשּׁוּם דְּדֶרֶךְ טוּמְאָה לָצֵאת, וְאִי מִשּׁוּם דְּטוּמְאָה טְמוּנָה בּוֹקַעַת. וְקָאָמַר לֵיהּ רַבִּי יוֹסֵי: וּדְקָאָמְרַתְּ דֶּרֶךְ טוּמְאָה לָצֵאת – יָכוֹל הוּא לְהוֹצִיאָהּ לַחֲצָאִין אוֹ לְשׂוֹרְפָהּ בִּמְקוֹמָהּ, וּדְקָאָמְרַתְּ טוּמְאָה טְמוּנָה בּוֹקַעַת – טוּמְאָה טְמוּנָה אֵינָהּ בּוֹקַעַת.

English Translation:

Rather, it is clear that the first tanna says that if a source of impurity is inside the compartment of a chest that is inside the house, the house is impure, either because it is typical for a source of impurity to exit its location, or because he holds that a hidden source of impurity breaks through and ascends. And Rabbi Yosei disagrees and says to him: With regard to that which you say that it is typical for a source of impurity to exit its location, it is not necessarily so. One can remove the impure item in halves or burn it in its place inside the compartment. And with regard to that which you say that a hidden source of impurity breaks through and ascends, a hidden source of impurity does not break through. Consequently, Rabbi Yosei must hold that a hidden source of impurity does not break through and ascend.

קלאוד על הדף:

The dissent must therefore target the first clause, where the first tanna rules the house impure when the impurity sits inside the compartment. That ruling could rest on either of two grounds, and Rabbi Yosei rebuts each in turn: impurity need not exit, since one could remove it lachatza’in — in portions each below the requisite measure — or simply burn it in place; and hidden impurity does not break through at all. The second rebuttal is the load-bearing one, since it fixes Rabbi Yosei’s position as tumah temuna einah boka’at, and the rest of the amud tests that attribution.

Key Terms:

• דֶּרֶךְ טוּמְאָה לָצֵאת = it is impurity’s way to exit — the first tanna’s first ground
• טוּמְאָה טְמוּנָה בּוֹקַעַת = hidden impurity breaks through — the second ground
• לַחֲצָאִין (lachatza’in) = in halves — in portions each below the requisite measure

Segment 3

TYPE: רמי

The Gemara raises a contradiction between two statements of Rabbi Yosei.

Hebrew/Aramaic:

וְרָמֵי דְּרַבִּי יוֹסֵי אַדְּרַבִּי יוֹסֵי.

English Translation:

§Based on the previous statement of Rabbi Yosei, the Gemara established that Rabbi Yosei holds that a hidden source of impurity does not break through and ascend. And the Gemara raises a contradiction between that previous statement of Rabbi Yosei and another statement of Rabbi Yosei.

קלאוד על הדף:

Having just established Rabbi Yosei’s position, the Gemara immediately sets it against another ruling of his. The formula rami deRabbi Yosei aderabbi Yosei introduces an internal contradiction within a single sage’s views, which must be resolved either by distinguishing the cases or by re-reading one of the statements — and here the resolution will be a re-reading.

Key Terms:

• רָמֵי (rami) = he raises a contradiction — setting one statement against another
• אַדְּרַבִּי יוֹסֵי = against Rabbi Yosei — an internal contradiction in one sage

Segment 4

TYPE: משנה

The dog on the threshold: Rabbi Meir requires a cubic handbreadth in its neck.

Hebrew/Aramaic:

דִּתְנַן: הַכֶּלֶב שֶׁאָכַל בָּשָׂר מֵת, וּמֵת הַכֶּלֶב, וּמוּטָּל עַל הָאִסְקוּפָּה – רַבִּי מֵאִיר אוֹמֵר: אִם יֵשׁ בְּצַוָּארוֹ פּוֹתֵחַ טֶפַח – מֵבִיא אֶת הַטּוּמְאָה, וְאִם לָאו – אֵינוֹ מֵבִיא אֶת הַטּוּמְאָה.

English Translation:

As we learned in a mishna (Oholot 11:7): In the case of a dog that ate the flesh of a corpse, and the dog then died and is lying on the threshold in such a manner that its neck and mouth are facing toward the inside of the house, Rabbi Meir says: If there is an opening the size of one cubic handbreadth inside the neck of the dog, i.e., the neck itself constitutes this measure, the dog imports impurity into the house because the upper portion of the dog’s body overlies the impure item inside the dog and the impurity is transmitted through the neck and mouth of the dog into the house. But if there is not such a large cavity in the neck of the dog, then there is no halakha of a tent, and the dog does not import the impurity into the house.

קלאוד על הדף:

The contradicting source is a mishna in Oholot (11:7) describing a vivid case: a dog ate corpse-flesh, then died lying across a threshold with its neck and mouth facing into the house. Rabbi Meir makes everything turn on whether the dog’s neck contains potei’ach tefach, a cubic handbreadth of space. If it does, the neck functions as a tent conducting the impurity indoors; if not, there is no tent and the house stays pure.

Key Terms:

• אִסְקוּפָּה (iskufa) = a threshold — the sill at a doorway
• פּוֹתֵחַ טֶפַח = an opening of a cubic handbreadth — the minimum space forming a tent
• מֵבִיא אֶת הַטּוּמְאָה = it brings in the impurity

Segment 5

TYPE: משנה

Rabbi Yosei judges by position relative to the lintel.

Hebrew/Aramaic:

רַבִּי יוֹסֵי אוֹמֵר: רוֹאִין מִכְּנֶגֶד הַשָּׁקוֹף וְלִפְנִים – הַבַּיִת טָמֵא, מִכְּנֶגֶד הַשְּׁקוֹף וְלַחוּץ – הַבַּיִת טָהוֹר.

English Translation:

Rabbi Yosei says: One looks to determine exactly where on the threshold the dog is located. If the impure item inside the dog is located anywhere from opposite, i.e., under, the lintel and toward the inside of the house, the house is impure. If the dog is located anywhere from opposite the lintel and toward the outside of the house, the house remains pure.

קלאוד על הדף:

Rabbi Yosei’s ruling looks past the dog’s anatomy to its placement. From the shakof, the lintel, inward the house is impure; from the lintel outward it is pure. On its face this makes location decisive and says nothing about a handbreadth of space — which is exactly what will generate the contradiction two segments later.

Key Terms:

• שָׁקוֹף (shakof) = the lintel — the horizontal beam above a doorway
• רוֹאִין (ro’in) = one looks / we determine — the verb whose object Rava will reinterpret

Segment 6

TYPE: משנה

Rabbi Elazar judges by orientation: impurity exits through the rear.

Hebrew/Aramaic:

רַבִּי אֶלְעָזָר אוֹמֵר: פִּיו לִפְנִים הַבַּיִת – טָהוֹר, פִּיו לַחוּץ הַבַּיִת – טָמֵא, מִפְּנֵי שֶׁטּוּמְאָה יוֹצְאָה דֶּרֶךְ שׁוּלָיו.

English Translation:

Rabbi Elazar says: One must determine the exact manner in which the dog is lying on the threshold. If its mouth is located inside the house, but its rear is located outside the house, the house remains pure. If its mouth is located outside the house but its rear is located inside the house, the house is impure. This is because the source of impurity exits the dog’s body through its edge, i.e., its rear.

קלאוד על הדף:

Rabbi Elazar shifts the criterion again, to which way the carcass faces. Mouth indoors and rear outdoors leaves the house pure; mouth outdoors and rear indoors renders it impure. His reasoning is that the impurity will leave the dog’s body through its hindquarters (shulav) rather than its mouth, so the house is endangered by whichever end will actually discharge it.

Key Terms:

• שׁוּלָיו (shulav) = its rear / lower end — through which the impurity will exit
• פִּיו לִפְנִים = its mouth facing inward

Segment 7

TYPE: משנה

Rabbi Yehuda ben Beteira: impure either way.

Hebrew/Aramaic:

רַבִּי יְהוּדָה בֶּן בְּתִירָא אוֹמֵר: בֵּין כָּךְ וּבֵין כָּךְ, הַבַּיִת טָמֵא.

English Translation:

Rabbi Yehuda ben Beteira says: In both this case and that case, i.e., whether the dog is lying such that its mouth is inside the house or outside the house, the house is impure. The reason is that the impure item can exit through either the mouth or the rear.

קלאוד על הדף:

Rabbi Yehuda ben Beteira declines to distinguish. Since the swallowed matter could emerge through either the mouth or the rear, the house is impure in both configurations. His position completes a four-way tannaitic spread on a single case, each sage fixing on a different physical feature — cavity, position, orientation, or neither.

Key Terms:

• בֵּין כָּךְ וּבֵין כָּךְ = either this way or that way — in both configurations
• רַבִּי יְהוּדָה בֶּן בְּתֵירָא = a tanna of the generation before the destruction of the Temple

Segment 8

TYPE: קושיא

Is Rabbi Yosei not speaking where the neck lacks a handbreadth?

Hebrew/Aramaic:

מַאי לָאו, אַאֵין בְּצַוָּארוֹ פּוֹתֵחַ טֶפַח קָאֵי רַבִּי יוֹסֵי?

English Translation:

The Gemara analyzes the statement of Rabbi Yosei that if the dog is located anywhere from under the lintel and toward the inside of the house, the house is impure. What, is the statement of Rabbi Yosei not referring to a case where there is not an opening the size of one cubic handbreadth inside the dog’s neck, with regard to which Rabbi Meir says that the house remains pure? Accordingly, Rabbi Yosei is responding to Rabbi Meir and saying: Even if the neck of the dog is not the size of one cubic handbreadth, as long as the impure item inside the dog is located from under the lintel and toward the house, the house is impure because it overlies the impure item.

קלאוד על הדף:

The Gemara now presses the contradiction. If Rabbi Yosei is responding to Rabbi Meir precisely in the case Rabbi Meir declared pure — a neck without a cubic handbreadth — then he is ruling the house impure with no tent-space at all. The only mechanism left would be the impurity forcing its way out from where it lies concealed.

Key Terms:

• מַאי לָאו = is it not? — pressing a reading the Gemara will later reject
• קָאֵי (ka’ei) = he is addressing / responding to

Segment 9

TYPE: קושיא

That would mean hidden impurity does break through — contradicting segment 2.

Hebrew/Aramaic:

וּשְׁמַע מִינַּהּ: טוּמְאָה טְמוּנָה בּוֹקַעַת!

English Translation:

And therefore learn from it that Rabbi Yosei holds that a hidden source of impurity breaks through and ascends, contrary to Rabbi Yosei’s opinion as understood from his previous statement.

קלאוד על הדף:

The conclusion is stated bluntly: on that reading Rabbi Yosei holds tumah temuna boka’at, hidden impurity breaks through and ascends. That is the opposite of what the chest-compartment ruling established, and the contradiction stands until Rava resolves it.

Key Terms:

• שְׁמַע מִינַּהּ = learn from it — drawing a conclusion from a source
• בּוֹקַעַת (boka’at) = it breaks through — forcing its way up past an enclosure

Segment 10

TYPE: תירוץ

Rava: Rabbi Yosei said ‘we look at the cavity,’ and disputes Rabbi Meir on two points.

Hebrew/Aramaic:

אָמַר רָבָא: רוֹאִין אֶת חֲלַל הַטּוּמְאָה קָתָנֵי, וְרַבִּי יוֹסֵי בְּתַרְתֵּי פְּלִיג, וְקָאָמַר לֵיהּ לְרַבִּי מֵאִיר: דְּקָאָמְרַתְּ כִּי יֵשׁ בְּצַוָּארוֹ פּוֹתֵחַ טֶפַח מֵבִיא אֶת הַטּוּמְאָה – אֲנַן בָּתַר חֲלָלַהּ אָזְלִינַן.

English Translation:

Rava said: Rabbi Yosei holds that a hidden source of impurity does not break through and ascend. As for that which Rabbi Yosei teaches: One looks whether the impure item inside the dog is located opposite the lintel and toward the inside of the house, Rabbi Yosei actually teaches: One looks at the empty space adjacent to the source of impurity. And Rabbi Yosei disagrees with Rabbi Meir with regard to two matters, and says to Rabbi Meir: As for that which you say that if there is the width of one cubic handbreadth in the neck of the dog, it imports the impurity into the house, that is not so. Rather, we follow the measure of the empty space, i.e., the neck of the dog imports impurity into the house only if it contains a cubic handbreadth of space in addition to the thickness of the flesh of the neck itself.

קלאוד על הדף:

Rava dissolves the contradiction by correcting the text of Rabbi Yosei’s statement. What he said is ro’in et chalal hatumah — we look at the empty space adjacent to the impurity. On that reading Rabbi Yosei is not conceding a tentless case at all; he disputes Rabbi Meir on two fronts, the first being the measure itself. The handbreadth must be genuine hollow space, not counting the thickness of the neck’s flesh, so Rabbi Meir’s threshold is harder to reach than he supposed.

Key Terms:

• חֲלַל הַטּוּמְאָה = the cavity of the impurity — the empty space adjacent to it
• בְּתַרְתֵּי פְּלִיג = he disputes on two matters
• בָּתַר חֲלָלָהּ אָזְלִינַן = we follow its cavity — measuring the hollow, not the flesh

Segment 11

TYPE: תירוץ

And the second dispute: only from the lintel inward is impure, not the whole house.

Hebrew/Aramaic:

וּדְקָא אָמְרַתְּ הַבַּיִת כּוּלּוֹ טָמֵא – מִכְּנֶגֶד הַשְּׁקוֹף וְלִפְנִים הַבַּיִת טָמֵא, מִכְּנֶגֶד הַשְּׁקוֹף וְלַחוּץ הַבַּיִת טָהוֹר.

English Translation:

And with regard to that which you say that even if the dog is located on the outer portion of the threshold of the house, the entire house is impure, that is not so. Rather, if the impurity inside the dog is located anywhere from opposite the lintel and toward the inside of the house, the house is impure. If the impurity inside the dog is located anywhere from opposite the lintel and toward the outside of the house, the house remains pure.

קלאוד על הדף:

The second point of Rabbi Yosei’s dispute concerns scope rather than threshold. Against the view that the entire house becomes impure, he holds that only the portion from the lintel inward is affected, while everything from the lintel outward stays pure. With both disputes identified as directed at Rabbi Meir’s own case — where a cavity does exist — Rabbi Yosei never ruled on concealed impurity, and his position that it does not break through is intact.

Key Terms:

• הַבַּיִת כּוּלּוֹ טָמֵא = the entire house is impure — the claim Rabbi Yosei limits
• מִכְּנֶגֶד הַשְּׁקוֹף וְלִפְנִים = from opposite the lintel and inward

Segment 12

TYPE: ראיה

Rav Acha son of Rava reports the reading as explicit in the mishna.

Hebrew/Aramaic:

רַב אַחָא בְּרֵיהּ דְּרָבָא מַתְנֵי לַהּ בְּהֶדְיָא: רַבִּי יוֹסֵי אוֹמֵר: רוֹאִין אֶת חֲלַל הַטּוּמְאָה.

English Translation:

Rav Acha, son of Rava, teaches that Rava’s explanation is explicit in the mishna itself, as follows: Rabbi Yosei says: One looks at the empty space adjacent to the source of impurity.

קלאוד על הדף:

Rava’s reconstruction receives textual confirmation. Rav Acha son of Rava transmits a version of the mishna in which Rabbi Yosei’s words are literally ro’in et chalal hatumah, so the reading is not an emendation imposed to save a position but the wording of the text as some had it. A resolution that turns out to be the received text rather than a reinterpretation carries considerably more weight.

Key Terms:

• מַתְנֵי לַהּ בְּהֶדְיָא = he teaches it explicitly — as the actual wording of the source
• רַב אַחָא בְּרֵיהּ דְּרָבָא = Rav Acha son of Rava, a late Babylonian amora

Segment 13

TYPE: שאלה

Who disagrees that overlying is called touching? Rabbi Shimon — and his baraita begins.

Hebrew/Aramaic:

וּמַאן תַּנָּא דִּפְלִיג עֲלֵיהּ? רַבִּי שִׁמְעוֹן הוּא, דְּתַנְיָא: רַבִּי שִׁמְעוֹן אוֹמֵר:

English Translation:

§Previously the Gemara established that Rabbi Yosei holds that with regard to the halakhot of impurity, overlying is referred to as touching, as the transmission of impurity via contact and via overlying are considered one category. But the mishna (Oholot 3:1) cited earlier (125b) states that in the case of one who touches half an olive-bulk of flesh of a corpse, if a tent simultaneously overlies him and another half an olive-bulk of flesh he remains pure. Evidently, there is a tanna who disagrees with Rabbi Yosei and holds that these two methods of transmitting impurity are not the same category. The Gemara asks: Who is the tanna who disagrees with Rabbi Yosei? The Gemara answers: It is Rabbi Shimon, as it is taught in a baraita: Rabbi Shimon says:

קלאוד על הדף:

The Gemara returns to the question left open on 125b. Rabbi Yosei treats overlying as a form of touching, but the Oholot mishna cited there ruled pure in a case that assumed the two are separate categories, so some tanna must hold that view. The answer is Rabbi Shimon, and the baraita setting out his position begins here and runs onto 126b.

Key Terms:

• וּמַאן תַּנָּא דִּפְלִיג עֲלֵיהּ = and who is the tanna who disagrees with him?
• רַבִּי שִׁמְעוֹן = Rabbi Shimon bar Yochai, a leading tanna of the generation after Bar Kochba

Amud Bet (126b)

Segment 1

TYPE: ברייתא

Rabbi Shimon: three corpse-impurities each transmit in two modes but not the third.

Hebrew/Aramaic:

שָׁלֹשׁ טוּמְאוֹת פּוֹרְשׁוֹת מִן הַמֵּת, שְׁתַּיִם בְּכׇל אַחַת וּשְׁלִישִׁית אֵין בָּהֶן, וְאֵלּוּ הֵן: מְלֹא תַרְוָוד רָקָב, וְעֶצֶם כִּשְׂעוֹרָה, וְגוֹלֵל וְדוֹפֵק.

English Translation:

Parts of a corpse that impart impurity include an olive-bulk of flesh, a complete limb, the majority of a corpse’s bones, and the majority of the essential bones of its skeleton, namely, its legs, spine, and ribs. All of these impart impurity via contact, carrying, and in a tent. There are also three sources of impurity that derive from a corpse, each one of which imparts impurity in two ways but does not impart impurity in a third way. And they are the following: A full ladle of dust from a corpse, and a bone the size of a barley grain, and a grave cover [golel] and a grave wall [dofek] upon which the cover rests.

קלאוד על הדף:

The baraita opens with a structural claim. Full sources of corpse impurity — an olive-bulk of flesh, a complete limb, most of the bones, most of the skeleton’s essential bones — transmit alike by contact, by carrying and in a tent. But three sources are partial, each lacking one of the three modes: a full ladle of corpse-dust, a barley-grain of bone, and the cover and wall of a grave. The three-mode grid is the organizing framework of corpse-impurity law, and this baraita maps its exceptions.

Key Terms:

• מְלֹא תַרְוָוד רָקָב = a full ladle of corpse-dust
• עֶצֶם כִּשְׂעוֹרָה = a bone the size of a barley grain
• גּוֹלֵל וְדוֹפֵק = a grave cover and the wall supporting it

Segment 2

TYPE: ברייתא

Corpse-dust: by carrying and tent, not by contact.

Hebrew/Aramaic:

מְלֹא תַרְוָוד רָקָב – מְטַמֵּא בְּמַשָּׂא וּבְאֹהֶל, וְאֵינוֹ מְטַמֵּא בְּמַגָּע, וְהֵיכָן מַגָּעוֹ? עִם אַחַת מֵהֶן.

English Translation:

A full ladle of dust imparts impurity via carrying and in a tent, but it does not impart impurity via contact, as it is impossible for one to touch all of the particles of dust simultaneously. And where among these sources of impurity is the imparting of impurity via contact applicable? It is applicable with one of those other two sources of impurity, i.e., a bone the size of a barley grain and the cover or wall of a grave.

קלאוד על הדף:

The first exception is explained by physical impossibility rather than by decree. A ladle of dust transmits by carrying and in a tent because one bears or overlies the whole quantity at once, but not by contact, since no hand can touch every particle simultaneously and the measure is what generates the impurity. The baraita’s closing formula — where is its contact? with one of the others — notes that each mode is supplied somewhere within the trio.

Key Terms:

• רָקָב (rakav) = the dust of a decomposed corpse
• וְהֵיכָן מַגָּעוֹ = and where is its contact? — the formula noting which source supplies the missing mode

Segment 3

TYPE: ברייתא

A barley-grain of bone: by carrying and contact, not in a tent.

Hebrew/Aramaic:

עֶצֶם כִּשְׂעוֹרָה – מְטַמֵּא בְּמַשָּׂא וּבְמַגָּע, וְאֵינוֹ מְטַמֵּא בְּאֹהֶל, וְהֵיכָן אׇהֳלוֹ? עִם אַחַת מֵהֶן.

English Translation:

A bone the size of a barley grain imparts impurity via carrying and contact, but it does not impart impurity in a tent. This halakha was transmitted to Moses from Sinai. And where among these sources of impurity is impurity imparted in a tent? It is with one of those other two sources of impurity.

קלאוד על הדף:

The second exception has no such practical explanation and is received as halacha leMoshe miSinai, a law transmitted orally to Moshe at Sinai. A bone this small transmits by contact and carrying yet never fills a tent — a rule with real consequences, since it is precisely why a kohen may be permitted in spaces where minute bone fragments are present but no larger remains.

Key Terms:

• הֲלָכָה לְמֹשֶׁה מִסִּינַי = a law transmitted orally to Moshe at Sinai, without scriptural derivation
• כִּשְׂעוֹרָה (kis’ora) = the size of a barley grain — the minimum measure of bone imparting impurity

Segment 4

TYPE: ברייתא

Grave cover and wall: by contact and tent, not by carrying — and Rabbi Shimon differs from Rabbi Yosei.

Hebrew/Aramaic:

הַגּוֹלֵל וְדוֹפֵק – מְטַמֵּא בְּמַגָּע וּבְאֹהֶל, וְאֵינוֹ מְטַמֵּא בְּמַשָּׂא, וְהֵיכָן מַשָּׂאוֹ? עִם אֶחָד מֵהֶן.

English Translation:

A grave cover and a grave wall impart impurity via contact and in a tent, but they do not impart impurity via carrying. This halakha too was transmitted to Moses from Sinai. And where among these sources of impurity is impurity transmitted via carrying? It is with one of those other two sources of impurity. It may be inferred from Rabbi Shimon’s statement that a full ladle of dust imparts impurity in a tent but not via contact that he disagrees with Rabbi Yosei and holds that overlying is not the same category as touching.

קלאוד על הדף:

The third exception is likewise halacha leMoshe miSinai: the golel and dofek transmit by contact and in a tent but not by carrying. The Gemara’s interest, though, is in the first exception rather than the third. Since Rabbi Shimon has corpse-dust transmitting in a tent while explicitly denying that it transmits by contact, he must regard the two as genuinely separate categories — which is the disagreement with Rabbi Yosei the Gemara was looking for.

Key Terms:

• גּוֹלֵל (golel) = the covering stone of a grave
• דּוֹפֵק (dofek) = the wall or support on which the covering stone rests

Segment 5

TYPE: ברייתא

A baraita on the sealed thigh bone: ‘its carcass’ excludes it.

Hebrew/Aramaic:

קוּלִית נְבֵלָה וְקוּלִית הַשֶּׁרֶץ וְכוּ׳. תָּנוּ רַבָּנַן: ״בְּנִבְלָתָהּ״ – וְלֹא בְּקוּלִית סְתוּמָה.

English Translation:

§The mishna teaches: With regard to the thigh bone of an unslaughtered carcass and the thigh bone of a creeping animal, one who touches them when they are sealed remains ritually pure, because the bone itself does not impart impurity. With regard to this topic, the Sages taught in a baraita: The verse states: “One who touches the carcass thereof shall be impure until the evening” (Leviticus 11:39). The word “carcass” indicates that one who touches the carcass is impure, but one who touches a sealed thigh bone is not.

קלאוד על הדף:

The Gemara returns to the mishna’s ruling on the sealed kulit and supplies its scriptural basis. Vayikra 11:39 speaks of one who touches benivlatah, its carcass — and the term is read restrictively: touching the carcass imparts impurity, but touching a sealed thigh bone, whose impure marrow is wholly enclosed, does not.

Key Terms:

• בְּנִבְלָתָהּ (benivlatah) = its carcass — the term read as excluding a sealed bone
• קוּלִית סְתוּמָה = a sealed thigh bone — with no access to the marrow

Segment 6

TYPE: ברייתא

The governing principle: what can be touched imparts impurity, what cannot does not.

Hebrew/Aramaic:

יָכוֹל אֲפִילּוּ נִיקְּבָה? תַּלְמוּד לוֹמַר ״הַנּוֹגֵעַ … יִטְמָא״, אֶת שֶׁאֶפְשָׁר לִיגַּע – טָמֵא, וְאֶת שֶׁאִי אֶפְשָׁר לִיגַּע – טָהוֹר.

English Translation:

One might have thought that even one who touches a perforated thigh bone remains pure. Therefore, the verse states: “One who touches the carcass thereof [benivlatah] shall be impure,” indicating that one who touches a part of the animal through which it is possible to touch the flesh, which has the halakhic status of an unslaughtered carcass [neveila], is impure, but one who touches a part of the animal through which it is impossible to touch the flesh remains pure. Therefore, one who touches a protective layer such as the outside of a sealed thigh bone does not become impure, as it is impossible to touch the marrow.

קלאוד על הדף:

A second phrase of the verse supplies the limit on the exclusion. Were the reading unqualified, even a perforated bone would leave one pure; hanogea… yitma teaches otherwise, and the baraita distills the rule into a formula — et she’efshar liga tamei, et she’i efshar liga tahor. Accessibility, not proximity, is what makes contact-impurity operate, and this principle governs the remainder of the daf.

Key Terms:

• אֶת שֶׁאֶפְשָׁר לִיגַּע = that which it is possible to touch — and which therefore imparts impurity
• וְאֶת שֶׁאִי אֶפְשָׁר לִיגַּע = and that which it is impossible to touch — which does not

Segment 7

TYPE: קושיא ותירוץ

Rabbi Zeira: then an animal in its hide should not transmit. Abaye: count its openings.

Hebrew/Aramaic:

אֲמַר לֵיהּ רַבִּי זֵירָא לְאַבָּיֵי: אֶלָּא מֵעַתָּה, בְּהֵמָה בְּעוֹרָהּ לֹא תְּטַמֵּא? פּוֹק חֲזִי כַּמָּה נְקָבִים יֵשׁ בָּהּ!

English Translation:

Rabbi Zeira said to Abaye: If that is so, that one who touches the protective layer of a carcass via which it is impossible to touch the flesh of the carcass itself does not become impure, an animal still in its hide should not impart impurity, as one can touch the hide, which constitutes a protective layer, but not the flesh. Abaye answered: Go out and see how many orifices there are in the body of an animal via which one can touch the flesh, e.g., the eyes, the nostrils, and the mouth.

קלאוד על הדף:

Rabbi Zeira presses the principle to what looks like an absurdity: if only accessible matter transmits, then an intact carcass still in its hide should convey nothing, since a hand meets only leather. Abaye’s answer is memorable for its plainness — pok chazi, go out and look at how many orifices an animal has. Eyes, nostrils, mouth: flesh is always reachable somewhere. The reply resolves a conceptual objection by sending the questioner to observe the world.

Key Terms:

• פּוֹק חֲזִי (pok chazi) = go out and see — an appeal to ordinary observation
• בְּהֵמָה בְּעוֹרָהּ = an animal in its hide — still fully covered
• נְקָבִים (nekavim) = orifices / openings

Segment 8

TYPE: קושיא ותירוץ

Rav Pappa: then a kidney encased in fat should not transmit. Rava: count its sinews.

Hebrew/Aramaic:

אֲמַר לֵיהּ רַב פָּפָּא לְרָבָא: אֶלָּא מֵעַתָּה, כּוּלְיָא בְּחֶלְבָּהּ לֹא תְּטַמֵּא? תָּא חֲזִי כַּמָּה חוּטִין נִמְשָׁכִין הֵימֶנָּה.

English Translation:

Similarly, Rav Pappa said to Rava: If that is so, that one who touches the protective layer of a carcass via which it is impossible to touch the flesh of the carcass itself does not become impure, the kidney of a carcass that is completely covered in its fat should not impart impurity via contact. Rava answered: Come and see how many sinews emerge from the kidney that one is able to touch.

קלאוד על הדף:

Rav Pappa raises the same objection in a tighter case: a kidney entirely sheathed in its own fat, where no orifice offers a way in. Rava answers in Abaye’s register — ta chazi, come and see how many sinews run out of it. The chutin emerging from the kidney are themselves flesh and are entirely touchable, so accessibility survives even here. Two objections, two teachers, and the same instruction to go and look.

Key Terms:

• כּוּלְיָא בְּחֶלְבָּהּ = a kidney in its fat — entirely encased
• חוּטִין (chutin) = sinews or fibres extending from the kidney
• תָּא חֲזִי (ta chazi) = come and see

Segment 9

TYPE: בעיא

Rav Oshaya asks whether intending to perforate counts as an act still lacking.

Hebrew/Aramaic:

בָּעֵי רַב אוֹשַׁעְיָא: חִישֵּׁב עָלֶיהָ לְנוֹקְבָהּ וְלֹא נִיקְּבָה, מַהוּ? מְחוּסַּר נְקִיבָה כִּמְחוּסַּר מַעֲשֶׂה דָּמֵי, אוֹ לָא?

English Translation:

§The mishna taught that the halakha distinguishes between a sealed and a perforated thigh bone of a carcass or a creeping animal. With regard to this topic, Rav Oshaya raises a dilemma: What is the halakha if one intended to perforate the thigh bone but did not yet perforate it? This is the dilemma: Is a thigh bone lacking perforation considered to be lacking the necessary action for it to impart impurity, and it therefore retains its status as a sealed thigh bone, or not?

קלאוד על הדף:

Rav Oshaya raises a dilemma about intention. If a person has resolved to perforate the bone but has not yet done so, is it mechusar nekiva kimchusar ma’aseh — treated as still lacking a required act, and therefore still sealed? The question probes how far intention alone can change an object’s halachic status, a theme that has recurred throughout these dafim in the rules of machshava and nullification.

Key Terms:

• מְחוּסַּר נְקִיבָה = lacking perforation
• כִּמְחוּסַּר מַעֲשֶׂה = as one lacking a required act — and so not yet in the new status

Segment 10

TYPE: פשיטות

He resolves it himself: the intention suffices, and it is impure immediately.

Hebrew/Aramaic:

הֲדַר פַּשְׁטַהּ: מְחוּסַּר נְקִיבָה לָאו כִּמְחוּסַּר מַעֲשֶׂה דָּמֵי.

English Translation:

Rabbi Oshaya then resolves the dilemma: A thigh bone lacking perforation is not considered to be lacking the necessary action for it to impart impurity. If one intends to perforate it, it imparts impurity immediately.

קלאוד על הדף:

Rav Oshaya answers his own question — hadar pashtah, he then resolved it. A bone awaiting perforation is not treated as lacking a required act; the settled intention to perforate renders it impure at once, without waiting for the hole. A sage posing a dilemma and then resolving it within the same passage is a recognized pattern in the Talmud, and it is preserved here rather than smoothed away.

Key Terms:

• הֲדַר פַּשְׁטַהּ = he then resolved it — answering his own dilemma
• לָאו כִּמְחוּסַּר מַעֲשֶׂה דָּמֵי = it is not considered as lacking an act

Segment 11

TYPE: משנה

A new mishna: the sealed egg of a creeping animal, and the half-earth mouse.

Hebrew/Aramaic:

מַתְנִי׳ בֵּיצַת הַשֶּׁרֶץ הַמְרוּקֶּמֶת טְהוֹרָה, נִיקְּבָה כׇּל שֶׁהוּא – טָמֵא. עַכְבָּר שֶׁחֶצְיוֹ בָּשָׂר וְחֶצְיוֹ אֲדָמָה – הַנּוֹגֵעַ בַּבָּשָׂר טָמֵא, בָּאֲדָמָה טָהוֹר. רַבִּי יְהוּדָה אוֹמֵר: אַף הַנּוֹגֵעַ בָּאֲדָמָה שֶׁכְּנֶגֶד הַבָּשָׂר טָמֵא.

English Translation:

MISHNA: The egg of a creeping animal in which tissue of an embryo developed and one who comes into contact with the egg are ritually pure, as the impure creeping animal is hermetically sealed. But if one perforated the egg with a hole of any size, one who comes in contact with the egg is ritually impure. In the case of a mouse that grows from the ground and is half-flesh half-earth, one who touches the half that is flesh is impure; one who touches the half that is earth is pure. Rabbi Yehuda says: Even one who touches the half that is earth where it is adjacent to the flesh is ritually impure.

קלאוד על הדף:

A fresh mishna introduces two cases that both turn on the accessibility principle just established. First, the egg of a sheretz in which an embryo has formed (merukemet): sealed, it leaves one pure, since the shell encloses the impure creature completely; perforated by any amount, it imparts impurity. Second, a mouse that is half flesh and half earth — touching the flesh imparts impurity, touching the earth does not, and Rabbi Yehuda extends impurity to the earth directly adjacent to the flesh.

Key Terms:

• בֵּיצַת הַשֶּׁרֶץ = the egg of a creeping animal
• מְרוּקֶּמֶת (merukemet) = in which an embryo has formed
• עַכְבָּר שֶׁחֶצְיוֹ בָּשָׂר וְחֶצְיוֹ אֲדָמָה = a mouse half of which is flesh and half earth

Segment 12

TYPE: דרשה

The term ‘hatteme’im’ includes the egg and the thigh bone of a creeping animal.

Hebrew/Aramaic:

גְּמָ׳ תָּנוּ רַבָּנַן: ״הַטְּמֵאִים״ – לְרַבּוֹת בֵּיצַת הַשֶּׁרֶץ וְקוּלִית הַשֶּׁרֶץ.

English Translation:

GEMARA: The mishna states that in the case of an egg of a creeping animal in which tissue of an embryo developed, if it is perforated then one who touches it is ritually impure. With regard to this matter the Sages taught in a baraita: The verse states: “These are the impure ones to you among all that creep; whoever touches them when they are dead shall be impure until the evening” (Leviticus 11:31). The term “the impure ones” is interpreted as including the egg of a creeping animal and the thigh bone of a creeping animal in the category of sources of impurity.

קלאוד על הדף:

The Gemara supplies the derivation. The apparently superfluous hatteme’im in Vayikra 11:31 is read as an inclusion, bringing both the sheretz’s egg and its thigh bone within the sources of impurity. The same term was mined on daf 120 to include the juice and gravy of creeping animals, and on 122 to include their skins — a single word doing repeated exegetical work across the masechet.

Key Terms:

• הַטְּמֵאִים (hatteme’im) = the impure ones — the term read as an inclusion
• לְרַבּוֹת (leravot) = to include — the function of an apparently superfluous term

Segment 13

TYPE: דרשה

‘Hasheretz’ limits it to an egg in which tissue has formed.

Hebrew/Aramaic:

יָכוֹל אֲפִילּוּ לֹא רִיקְּמָה? תַּלְמוּד לוֹמַר ״הַשֶּׁרֶץ״ – מָה שֶׁרֶץ שֶׁרִקֵּם, אַף בֵּיצַת הַשֶּׁרֶץ שֶׁרִקְּמָה.

English Translation:

One might have thought that even an egg in which tissue of an embryo has not developed imparts impurity. Therefore, the verse states: “That creep,” indicating that just as a creeping animal has developed tissue, so too only the egg of a creeping animal in which tissue of an embryo has developed imparts impurity.

קלאוד על הדף:

The inclusion is then bounded. One might have applied it to any sheretz egg, but the word hasheretz teaches a comparison: just as a creeping animal has formed tissue, so too only an egg whose embryo has developed falls within the rule. An unformed egg is not yet a creature in any sense the law recognizes.

Key Terms:

• מָה שֶׁרֶץ שֶׁרִקֵּם = just as a creeping animal has formed tissue
• יָכוֹל (yachol) = one might have thought — introducing an overbroad reading to be corrected

Segment 14

TYPE: דרשה

‘One who touches’ limits it further to a perforated egg.

Hebrew/Aramaic:

יָכוֹל אֲפִילּוּ לֹא נִיקְּבוּ? תַּלְמוּד לוֹמַר ״הַנּוֹגֵעַ … יִטְמָא״, אֶת שֶׁאֶפְשָׁר לִיגַּע – טָמֵא, וְאֶת שֶׁאִי אֶפְשָׁר לִיגַּע – טָהוֹר.

English Translation:

One might have thought that in the case of an egg in which tissue of an embryo has developed, it imparts impurity even if it was not perforated. Therefore, the verse states: “Whoever touches them when they are dead shall be impure,” indicating that when it is possible to touch the flesh, contact renders one impure; but when it is impossible to touch the flesh, one remains pure.

קלאוד על הדף:

A second limitation follows from hanogea… yitma, applying the same formula given earlier for the sealed bone: what can be touched imparts impurity, what cannot does not. A formed embryo sealed inside an intact shell is beyond reach, so the egg conveys nothing until it is opened. The two clauses of the verse thus produce a precise result — formed and perforated.

Key Terms:

• הַנּוֹגֵעַ יִטְמָא = one who touches shall be impure
• אֶת שֶׁאֶפְשָׁר לִיגַּע = that which it is possible to touch

Segment 15

TYPE: שיעור

The measure of the perforation: the width of a hair.

Hebrew/Aramaic:

וְכַמָּה נְקִיבָתָהּ? כְּחוּט הַשַּׂעֲרָה, שֶׁאֶפְשָׁר לִיגַּע כְּחוּט הַשַּׂעֲרָה.

English Translation:

And how large must its perforation be to render one touching the egg or thigh bone impure? Its width must be the size of a strand of hair, as it is possible for one to touch the inside of an egg or thigh bone with a strand of his hair.

קלאוד על הדף:

The Gemara fixes the threshold at k’chut hasa’ara, a hair’s breadth, and gives the reason in the same clause: because one can insert a hair through such an opening and touch what lies within. The measure follows directly from the accessibility principle rather than from any independent tradition — the smallest aperture through which contact is genuinely possible is exactly the smallest that matters.

Key Terms:

• כְּחוּט הַשַּׂעֲרָה = the width of a hair — the minimum perforation
• שֶׁאֶפְשָׁר לִיגַּע כְּחוּט הַשַּׂעֲרָה = since one can touch with a hair

Segment 16

TYPE: מימרא

Rabbi Yehoshua ben Levi: only where flesh developed along the mouse’s whole length.

Hebrew/Aramaic:

עַכְבָּר שֶׁחֶצְיוֹ [וְכוּ׳]. אָמַר רַבִּי יְהוֹשֻׁעַ בֶּן לֵוִי: וְהוּא שֶׁהִשְׁרִיץ עַל פְּנֵי כּוּלּוֹ. אִיכָּא דְּמַתְנֵי לַהּ אַסֵּיפָא – רַבִּי יְהוּדָה אוֹמֵר: אַף הַנּוֹגֵעַ בָּאֲדָמָה שֶׁכְּנֶגֶד בָּשָׂר טָמֵא, אָמַר רַבִּי יְהוֹשֻׁעַ בֶּן לֵוִי: וְהוּא שֶׁהִשְׁרִיץ עַל פְּנֵי כּוּלּוֹ.

English Translation:

§The mishna teaches: In the case of a mouse that grows from the ground and is half-flesh half-earth, one who touches the half that is flesh is impure. Rabbi Yehoshua ben Levi says in this regard: One becomes impure in such a case only if the flesh of the mouse has developed along the entire length of the mouse, from head to foot. Some teach the statement of Rabbi Yehoshua ben Levi with regard to the latter clause of the mishna: Rabbi Yehuda says: Even one who touches the half that is earth where it is adjacent to the flesh is ritually impure. Rabbi Yehoshua ben Levi says: One becomes impure in such a case only if the flesh of the mouse has developed along the entire length of the mouse.

קלאוד על הדף:

Rabbi Yehoshua ben Levi attaches a condition to the mishna’s ruling about the half-earth mouse: hishritz al penei kulo, the flesh must have developed along the creature’s entire length from head to foot. The Gemara records that some transmit this condition on the mishna’s opening clause and others only on Rabbi Yehuda’s clause about the adjacent earth.

Key Terms:

• הִשְׁרִיץ עַל פְּנֵי כּוּלּוֹ = it developed flesh along its entire length
• אִיכָּא דְּמַתְנֵי לַהּ = there are those who teach it — an alternative attachment of a statement

Segment 17

TYPE: ביאור

The practical difference between the two transmissions.

Hebrew/Aramaic:

מַאן דְּמַתְנֵי לַהּ אַרֵישָׁא, כׇּל שֶׁכֵּן אַסֵּיפָא, וּמַאן דְּמַתְנֵי לַהּ אַסֵּיפָא – אֲבָל רֵישָׁא, אַף עַל גַּב דְּלָא הִשְׁרִיץ.

English Translation:

The one who teaches the statement of Rabbi Yehoshua ben Levi with regard to the first clause of the mishna, all the more so he teaches this same halakha with regard to the latter clause of the mishna. But the one who teaches the statement of Rabbi Yehoshua ben Levi with regard to the latter clause of the mishna holds that it applies only to that clause, with regard to one who touches the half that is earth where it is adjacent to the flesh according to Rabbi Yehuda. But according to the opinion of the first tanna, stated in the first clause of the mishna, even if the flesh of the mouse has not developed along the entire length of the mouse, one who touches the half of the mouse that is flesh is impure.

קלאוד על הדף:

The Gemara spells out what turns on the choice. Whoever attaches the condition to the opening clause certainly holds it for the latter clause as well, since the latter is the more demanding case. But whoever attaches it only to the latter holds that in the opening clause, touching the flesh imparts impurity even without full development. The pattern — kol shekein in one direction, a restriction in the other — recurs throughout these dafim.

Key Terms:

• כׇּל שֶׁכֵּן (kol shekein) = all the more so — an a fortiori inference
• אַף עַל גַּב דְּלָא הִשְׁרִיץ = even though it did not develop fully

Segment 18

TYPE: ברייתא

Could the verse’s “mouse” include a sea mouse? A logical inference says no.

Hebrew/Aramaic:

תָּנוּ רַבָּנַן: מִתּוֹךְ שֶׁנֶּאֱמַר ״עַכְבָּר״, שׁוֹמֵעַ אֲנִי אֲפִילּוּ עַכְבָּר שֶׁבַּיָּם, שֶׁשְּׁמוֹ עַכְבָּר. וְדִין הוּא: טִימֵּא בְּחוּלְדָּה וְטִימֵּא בְּעַכְבָּר, מָה חוּלְדָּה מִין הַגָּדֵל עַל הָאָרֶץ, אַף עַכְבָּר מִין הַגָּדֵל עַל הָאָרֶץ.

English Translation:

§The Sages taught in a baraita concerning the following verse: “And these are they which are impure to you among the creeping animals that creep upon the earth: The weasel, and the mouse, and the great lizard after its kinds” (Leviticus 11:29). Since “mouse” is stated among the creeping animals that impart impurity, I would derive that even a sea mouse, i.e., a sea creature that has an appearance similar to a mouse, imparts impurity because its name is also mouse. But ostensibly, the opposite conclusion could be derived through logical inference: The verse deems a weasel impure and deems a mouse impure. Therefore, just as a weasel is a species that grows on land, so too the mouse to which the verse is referring is a species that grows on land; a sea mouse does not impart impurity.

קלאוד על הדף:

A baraita takes up whether the achbar of Vayikra 11:29 extends to a sea creature bearing the same name. An inference from the verse’s own pairing suggests not: the verse lists the weasel alongside the mouse, and since a weasel is a land species, the mouse it means should be one too. The argument reads a list as defining its members by shared character rather than by name alone.

Key Terms:

• עַכְבָּר שֶׁבַּיָּם = a sea mouse — a marine creature bearing the same name
• חוּלְדָּה (chulda) = a weasel — listed alongside the mouse in the verse
• מִין הַגָּדֵל עַל הָאָרֶץ = a species that grows on land

Segment 19

TYPE: ברייתא

Or the reverse: the name alone might govern — so the verse says “upon the earth.”

Hebrew/Aramaic:

אוֹ כְּלָךְ לְדֶרֶךְ זוֹ: טִימֵּא בְּחוּלְדָּה וְטִימֵּא בְּעַכְבָּר, מָה חוּלְדָּה כֹּל שֶׁשְּׁמָהּ ״חוּלְדָּה״, אַף עַכְבָּר כֹּל שֶׁשְּׁמוֹ ״עַכְבָּר״, אֲפִילּוּ עַכְבָּר שֶׁבַּיָּם שֶׁשְּׁמוֹ ״עַכְבָּר״. תַּלְמוּד לוֹמַר ״עַל הָאָרֶץ״.

English Translation:

Or, perhaps go this way: The verse deems a weasel impure and deems a mouse impure; accordingly, just as “weasel” is referring to any animal whose name is weasel, so too, “mouse” is referring to any animal whose name is mouse, even a sea mouse, as its name is also mouse. Therefore, the verse states: “Upon the earth,” indicating that a land mouse imparts impurity, but a sea mouse does not.

קלאוד על הדף:

The baraita then runs the inference the other way. Perhaps the pairing teaches that each term covers whatever bears its name, so that just as chulda means any weasel, achbar means any mouse, sea creatures included. With the logic pointing both directions, only the text can decide, and the verse’s phrase al ha’aretz — upon the earth — settles it: the land mouse imparts impurity, the sea mouse does not.

Key Terms:

• אוֹ כְּלָךְ לְדֶרֶךְ זוֹ = or go this way — introducing the opposite inference
• עַל הָאָרֶץ = upon the earth — the phrase resolving the ambiguity

Segment 20

TYPE: קושיא

A further question about location — and the daf breaks off.

Hebrew/Aramaic:

אִי ״עַל הָאָרֶץ״, יָכוֹל עַל הָאָרֶץ – יְטַמֵּא, יָרַד לְיָם – לֹא יְטַמֵּא,

English Translation:

If this halakha is derived only from the phrase “upon the earth,” one might have thought that the verse means that any mouse, whether a land mouse or a sea mouse, imparts impurity when it is upon the earth, but if it descended to the sea it does not impart impurity.

קלאוד על הדף:

The baraita immediately presses the phrase it just used. If al ha’aretz is doing the work, perhaps it describes location rather than species: any mouse would impart impurity while on land, and none once it entered the sea. The page ends mid-argument, and the resolution appears on 127a.

Key Terms:

• יָרַד לְיָם = it descended into the sea
• אִי (i) = if — introducing a challenge to a derivation just made

📝 Summary

Overview

Chullin 126 closes out the corpse-impurity digression that began on the previous daf and then returns to the mishna’s core concerns about what can and cannot be touched. Amud aleph resolves an apparent contradiction in Rabbi Yosei’s position on hidden impurity (tumah temuna) by re-reading his ruling in the case of the dog lying across a threshold. Amud bet turns to Rabbi Shimon’s baraita on the three partial sources of corpse impurity that transmit in only two of the three modes, then to the sealed thigh bone (kulit) and the principle that only what can be touched conveys impurity. A new mishna introduces the sheretz egg with a formed embryo and the mouse that is half flesh and half earth, and the Gemara begins deriving from the verse that a sea mouse is excluded — an argument that breaks off mid-derivation.

Amud Aleph Highlights

• A baraita records that Rabbi Yosei declares the house pure; the Gemara determines this responds to the first tanna’s ruling on impurity inside the chest compartment.
• Rabbi Yosei rebuts both possible grounds: impurity need not exit (it can be removed in halves, lachatza’in, or burned in place), and hidden impurity does not break through (tumah temuna einah boka’at).
• A contradiction is raised from Oholot 11:7: a dog that ate corpse-flesh, died, and lies across a threshold with its neck and mouth facing inward.
• Four tannaitic views are recorded on that case, turning variously on potei’ach tefach (a cubic handbreadth of space), position relative to the lintel (shakof), and orientation of mouth versus rear (shulav).
• Rava resolves the contradiction: Rabbi Yosei’s ro’in et chalal hatumah means one looks at the cavity adjacent to the impurity, so he disputes Rabbi Meir on two points and never held hidden impurity breaks through.
• Rav Acha son of Rava supports this by teaching ro’in et chalal hatumah in the mishna’s own wording.

Amud Bet Highlights

• Rabbi Shimon’s baraita: melo tarvad rakav (a ladle of corpse-dust) transmits by carrying and tent but not contact; etzem kis’ora (a barley-sized bone) by carrying and contact but not tent; golel vedofek (grave cover and supporting wall) by contact and tent but not carrying — the latter two as halacha leMoshe miSinai.
• Benivlatah (Vayikra 11:39) excludes a sealed kulit; hanogea teaches that only what it is possible to touch renders impure.
• Rabbi Zeira objects to Abaye from an animal in its hide (answer: its many orifices); Rav Pappa objects to Rava from a kidney encased in fat (answer: the sinews, chutin, extending from it).
• Rav Oshaya asks whether a bone one intends to perforate is mechusar nekiva kimchusar ma’aseh, and resolves that the intention alone renders it impure immediately.
• New mishna: a sheretz egg with a formed embryo (meruḳemet) is pure unless perforated by any amount; a mouse half flesh and half earth conveys impurity through its flesh.
• The perforation must be k’chut hasa’ara, a hair’s width, since one can touch the inside with a hair.
• Rabbi Yehoshua ben Levi limits the mouse ruling to where flesh developed along its entire length (hishritz al penei kulo); some attach this to the latter clause only.

Key Disputes

Conclusions

The apparent contradiction in Rabbi Yosei is resolved by Rava’s ro’in et chalal hatumah reading — the cavity, not the flesh, is measured — and confirmed by Rav Acha son of Rava from the mishna’s own language; Rabbi Yosei consistently holds that hidden impurity does not break through. Rav Oshaya raises his dilemma about a bone lacking perforation and himself resolves it: intention alone suffices to render it impure. The sea-mouse derasha is left unfinished, breaking off mid-argument and continuing on 127a.

Key Figures

Tannaim: Rabbi Meir, Rabbi Yosei, Rabbi Elazar, Rabbi Yehuda ben Beteira, Rabbi Shimon, Rabbi Yehuda, the first tanna

Amoraim: Rava, Rav Acha son of Rava, Rabbi Zeira, Abaye, Rav Pappa, Rav Oshaya, Rabbi Yehoshua ben Levi

One-Line Takeaway

Impurity is conveyed only through what is genuinely accessible — measured by the cavity beside it, the openings that reach it, and the touch that can actually land on it.

🎯 ELI5 (Explain Like I’m 5)

The Big Picture 🖼️

Today’s daf is all about one big question: does impurity that is sealed inside something still get out? We finish the chest puzzle from yesterday, meet a dog lying across a doorway with four sages arguing about it, and end up chasing a mouse into the sea.

Finishing the Chest Puzzle 📦

Yesterday we left a chest sitting inside a house. The chest has a little compartment, and inside that compartment is something impure.

The first tanna (an early Sage of the Mishna) says the whole house becomes impure. Why? Two possible reasons: either because derech tumah latzeit (impurity’s natural direction is to go OUT), or because tumah temuna boka’at (hidden impurity punches straight through walls).

Rabbi Yosei says no to both. You do not have to take the impure thing out — you could remove it in tiny pieces too small to matter, or simply burn it right where it sits. And hidden impurity does not punch through anything.

Think of it like… a smell in a sealed lunchbox. One opinion says the smell will always find its way out. Rabbi Yosei says: not if the lid is on tight, and anyway you could just throw the whole thing away without ever opening it.

The Simple Idea 💡: Rabbi Yosei’s rule is short and clean — hidden impurity stays put.

But Wait — The Dog on the Doorstep 🐕

Now the Gemara hits Rabbi Yosei with a problem, and it comes from a mishna in Oholot (the tractate about impurity spreading under a roof).

A dog ate flesh from a human corpse, and then the dog died lying across a doorway — half in the house, half outside. Corpse-impurity is the most serious kind in the Torah, and now it is sitting right in the entrance. Is the house impure?

Four sages, four different answers:

Here is the trouble. Rabbi Yosei seems to say the house is impure even when there is no hollow handbreadth — which would mean hidden impurity DOES punch through. That is the exact opposite of what he just said about the chest.

Think of it like… a friend who tells you on Monday that closed doors block noise completely, and then on Tuesday complains he can hear the neighbours through a closed door. You would want an explanation.

The Simple Idea 💡: Rabbi Yosei looks like he is contradicting himself, and the Gemara will not let that stand.

Rava Rescues Rabbi Yosei 🛟

Rava reads Rabbi Yosei’s words much more carefully. Rabbi Yosei said ro’in et chalal hatumah — “we look at the EMPTY SPACE next to the impurity.”

That one phrase changes everything. Rabbi Yosei is not agreeing that impurity punches through solid flesh. He is arguing with Rabbi Meir about two separate things at once.

First: when you measure that handbreadth, it has to be genuinely hollow space — you do not get to count the thickness of the dog’s neck flesh toward it. Second: even when there IS enough hollow space, only the part of the house from the lintel inward becomes impure, not the entire house.

Rav Acha son of Rava then points out that this reading is not clever guesswork — it is spelled out in the mishna’s own wording.

Think of it like… measuring whether a package fits through a mail slot. You measure the slot’s opening, not the thickness of the door around it.

The Simple Idea 💡: Rabbi Yosei never said hidden impurity punches through — he was arguing about how you measure the gap.

Rabbi Shimon’s Two-Out-Of-Three Club 🎯

So if not Rabbi Yosei, who actually disagrees with him about whether being under one roof counts the same as touching? Answer: Rabbi Shimon — and here is his teaching.

Most sources of corpse-impurity transmit it three ways: by touching, by carrying, and by ohel (being under one roof with it, literally “tent”). But Rabbi Shimon lists three special cases that each do only two of the three.

Why can the ladle of dust not be transmitted by touching? Because it is powder — you can never make contact with every single grain at once.

The other two exclusions are halacha leMoshe miSinai — laws taught to Moshe at Sinai and passed down orally, without a verse to derive them from.

Think of it like… a bag of flour. You can carry the whole bag, and you can be in the room with the whole bag, but you can never touch all of the flour at the same moment.

The Simple Idea 💡: Since Rabbi Shimon has the dust transmitting under a roof but not by touch, he clearly treats those as two different categories — and that is exactly where he splits from Rabbi Yosei.

What You Can Touch, You Can Catch 🤚

Back to our sealed thigh bone from earlier in the perek. A verse in Vayikra (11:39) says “one who touches the carcass” — the carcass itself. So touching the flesh makes you impure; touching a completely sealed bone does not, because you are only touching bone.

Then a second phrase in the verse teaches the general principle: what you CAN touch makes you impure; what you CANNOT touch does not.

Think of it like… a sealed envelope. Whatever is inside is real, but as long as it is fully sealed, you have not touched it — you have only touched paper.

The Simple Idea 💡: Impurity travels through contact, so if contact is impossible, so is the impurity.

Go Out and Count the Holes 👀

Now come two of the most charming exchanges in the whole masechet.

Rabbi Zeira challenges Abaye: if that is the rule, then a whole animal carcass still wearing its own hide should transmit nothing at all! All you can touch is skin.

Abaye’s answer: go out and look at how many openings an animal has. Eyes, nostrils, mouth. There is always a way to reach flesh.

Rav Pappa challenges Rava: then a kidney completely wrapped in its own layer of fat should transmit nothing either!

Rava’s answer: come and see how many sinews run out of it. Same idea — there is always a way in.

Notice what both teachers are doing. They are not producing a clever argument. They are telling their students to stop theorizing at the desk and go look at an actual animal.

Think of it like… arguing about whether a house is sealed while you are sitting in the kitchen — and your teacher says, go outside and count the windows.

The Simple Idea 💡: Nothing is really sealed once you actually go and look.

Rav Oshaya Asks — And Answers Himself 🤔

Rav Oshaya raises a lovely question. Suppose someone INTENDS to drill a hole in the bone but has not actually drilled it yet. Does the missing hole count as a missing action, so the bone is still legally sealed?

He thinks it over and then answers his own question: no. The intention alone is enough. The moment he decides to perforate it, it becomes impure.

Think of it like… deciding to open a package. Once your mind has moved it from “sealed forever” to “about to be opened,” it is no longer really a sealed thing.

The Simple Idea 💡: For this rule, deciding to make the hole is as good as making it.

A New Mishna: The Sealed Egg 🥚

We now start a new mishna with two unusual cases.

Case one: the egg of a sheretz (a creeping animal that carries impurity) with an embryo already formed inside. The mishna rules it is pure — the shell seals it completely. But poke the tiniest hole and it becomes impure.

Where does that come from? The Torah’s word hatteme’im (“the impure ones”) is read as including the sheretz’s egg and its thigh bone. The word hasheretz teaches that only an egg with formed tissue counts. And the phrase “one who touches” teaches that it must be perforated.

How big does the hole need to be? K’chut hasa’ara — the width of a single hair. Why that size? Because you could slide a hair in through the hole and touch what is inside.

Think of it like… a sealed envelope with a pinhole in it. It looks sealed, but a single thread can get in — and that is enough.

The Simple Idea 💡: A hair’s width of an opening is the difference between sealed and touchable.

The Half-Earth Mouse 🐭

Case two of the mishna: a mouse that is half flesh and half earth — an understanding of how certain creatures came into being that was widely held in the ancient world.

The halachic question is beautifully precise: where does the impure creature begin? Touch the flesh half and you become impure. Touch the earth half and you stay pure, because that part is not yet a mouse.

Rabbi Yehuda extends the line a little: even the earth immediately adjacent to the flesh conveys impurity.

Rabbi Yehoshua ben Levi adds a condition — this applies only where the flesh has developed along the mouse’s whole length. Some Sages attach his condition to the mishna’s first clause; others attach it only to Rabbi Yehuda’s clause about the neighbouring earth.

Think of it like… drawing a boundary line on a map where one country fades into another. Everyone agrees there is a line — the argument is about exactly where to put the pen.

The Simple Idea 💡: Impurity begins where the creature begins, and the Sages are mapping that border precisely.

Chasing a Mouse into the Sea 🌊

The Torah lists “mouse” among the impure creeping things. So the Gemara asks: does that include a sea mouse — a sea creature that happens to go by the same name?

Two arguments pull in opposite directions. On one hand, the verse pairs the mouse with the chulda (weasel), and a weasel is a land animal — so a mouse should be a land animal too. On the other hand, maybe just as “weasel” means anything called a weasel, “mouse” means anything called a mouse, sea included.

The verse settles it with two words: al ha’aretz — “upon the earth.” Land mouse yes, sea mouse no.

Then a further question opens up — maybe any mouse counts while it is on land, but stops counting once it goes into the sea? — and the daf cuts off mid-sentence. We pick it up on 127a.

Think of it like… a sign that says “no dogs on the grass.” Does it cover a sea dog? The sign itself has to tell you, and here the sign says: upon the earth.

The Simple Idea 💡: The word means the creature that lives on land, and the daf ends with the follow-up question still hanging.

The Super Simple Summary 🎯

• Rabbi Yosei holds that hidden impurity stays put — it does not punch through a sealed container.
• The dog lying across a doorway looked like a contradiction to that, until Rava showed Rabbi Yosei was really talking about measuring hollow SPACE, not solid flesh.
• Rabbi Shimon lists three sources that each transmit impurity in only two of the three ways: a ladle of corpse-dust (no touching), a barley-sized bone (no tent), and a grave cover (no carrying).
• The master rule: what you CAN touch conveys impurity; what you cannot touch does not.
• When students objected that hide and fat should seal things off, Abaye and Rava both said the same thing — go outside and look. Animals have eyes, nostrils and mouths; kidneys have sinews running out. There is always a way in.
• Rav Oshaya asked whether merely intending to drill a hole counts, and answered himself: yes, intention is enough.
• A sealed sheretz egg is pure; a hole the width of a single hair makes it impure, because a hair could reach inside.
• With the half-flesh half-earth mouse, the flesh conveys impurity and the earth does not — Rabbi Yehuda adds the adjacent earth too.
• A sea mouse is not included in the Torah’s impure “mouse,” because the verse says al ha’aretz, upon the earth — and the next question runs on to 127a.

⚖️ Halacha

The Three Partial Corpse-Impurities: Contact, Carrying, and Tent

Source in Daf: 126b, Segments 1-4

Rabbi Shimon’s baraita presents a striking structural grid. Corpse-impurity is normally transmitted in three modes: maga (contact), masa (carrying), and ohel (being under the same roof or covering). But three sources of impurity each transmit in exactly two of the three, and are excluded from the third. Two of these exclusions are halacha leMoshe miSinai — laws received orally at Sinai with no derivation from a verse. The Rambam codifies all three cases, each in its own halacha, and in every case he states the exclusion explicitly.

Rambam — Hilchot Tumat Met 2:11 (melo tarvad rakav — corpse-dust)

Hebrew:

מֵת שֶׁהִרְקִיבוּ עַצְמוֹתָיו בַּקֶּבֶר וְנַעֲשׂוּ רֶקֶב. מְלֹא חָפְנַיִם מֵאוֹתוֹ רֶקֶב מְטַמֵּא בְּמַשָּׂא וּבְאֹהֶל כְּמֵת וְאֵינוֹ מְטַמֵּא בְּמַגָּע לְפִי שֶׁאִי אֶפְשָׁר לִגַּע בְּכֻלּוֹ שֶׁהֲרֵי אֵינוֹ גּוּף אֶחָד. וַאֲפִלּוּ גִּבְּלוֹ בְּמַיִם אֵינוֹ חִבּוּר

English:

When the bones of a corpse decompose in the grave and become a rekev, two handfuls of that rekev impart impurity when that quantity is carried or it is located under the same structure as a person or object. It does not, however, impart impurity when it is touched, because it is impossible to touch it in its entirety, because it is not a whole entity. Even if it was mixed with water, the different portions are not considered as joined together.

Connection: This is precisely Rabbi Shimon’s first case — rakav transmits by carrying and by tent but not by contact. Note that the Rambam supplies the reason, and it is the very principle the Gemara will develop later on this amud in the thigh-bone baraita: et she’efshar liga — impurity by contact requires that the whole quantity be touchable at once. A ladle of dust is a scatter of particles, not a single body, so no single act of touching can reach all of it. The Rambam adds the closing detail that even kneading the dust with water does not make it a unit (eino chibbur), foreclosing the obvious workaround.

Rambam — Hilchot Tumat Met 2:10 (etzem kis’ora — a barley-grain bone)

Hebrew:

הָיָה עֶצֶם אֶחָד אֲפִלּוּ יֵשׁ בּוֹ רֹבַע הֲרֵי זֶה מְטַמֵּא בְּמַגָּע וּבְמַשָּׂא וְאֵינוֹ מְטַמֵּא בְּאֹהֶל. טֻמְאַת עֶצֶם אֶחָד הֲלָכָה מִפִּי הַשְּׁמוּעָה לְפִי שֶׁנֶּאֱמַר כָּל הַנּוֹגֵעַ בַּעֶצֶם לָמְדוּ מִפִּי הַשְּׁמוּעָה אֲפִלּוּ עֶצֶם כִּשְׂעוֹרָה מְטַמֵּא בְּמַגָּע וּבְמַשָּׂא. וּלְפִי שֶׁטֻּמְאָתוֹ הֲלָכָה הֲרֵי הוּא דִּין תּוֹרָה וְלֹא מִדִּבְרֵי סוֹפְרִים

English:

If there is one bone, even if it is a fourth of a kab in size, it imparts impurity when it is touched or carried. It does not, however, impart impurity through being under the same structure. The impurity imparted by one bone is a halachah conveyed by the Oral Tradition. Numbers 19:18 states: “And all who touch the bone.” The Oral Tradition teaches that even a bone the size of a barley-corn imparts impurity when it is touched or carried. Since this impurity is taught as halachah by the Oral Tradition, it is considered as Scriptural Law and not as a Rabbinic decree.

Connection: Rabbi Shimon’s second case, codified exactly: contact and carrying, but not tent. The Rambam preserves the Gemara’s own justification — that the exclusion from ohel is halacha leMoshe miSinai, received orally rather than derived. He then draws out the consequence the daf leaves implicit: because the rule is a Sinaitic tradition, it carries full Scriptural force (din Torah), not merely rabbinic weight. That matters for the stringencies applied in cases of doubt.

The Rambam also adds a point of scale that sharpens the sugya: afilu yesh bo rova — even a bone as large as a quarter-kab, if it is a single bone, still does not transmit in a tent. The exclusion from ohel is not about smallness; it is about the bone being one isolated bone rather than the quantity of bones the Torah requires for tent-impurity.

Practical note for kohanim. This is not archival law. A kohen who must pass near an excavation, a construction site, or the edge of a cemetery is governed by exactly this grid. A single loose bone of barley-grain size lying in an open trench does not convey impurity to a kohen who walks over it under a roof or overhang, because a single bone is excluded from ohel — but he becomes impure the moment he touches it or shifts it. The distinction is operative precisely because the two exclusions cut in opposite directions, as the next source shows.

Rambam — Hilchot Tumat Met 2:15 (golel and dofek — grave cover and support)

Hebrew:

הַקֶּבֶר כָּל זְמַן שֶׁהַטֻּמְאָה בְּתוֹכוֹ מְטַמֵּא בְּמַגָּע וּבְאֹהֶל כְּמֵת דִּין תּוֹרָה. שֶׁנֶּאֱמַר אוֹ בְמֵת אוֹ בְעֶצֶם אָדָם אוֹ בְקָבֶר… אֲבָל הַמַּעֲמִיד כֵּלִים אוֹ אֲבָנִים וְכַיּוֹצֵא בָּהֶן בְּצִדֵּי הַמֵּת וְכִסָּה עָלָיו מִלְּמַעְלָה בְּכֵלִים אוֹ בַּאֲבָנִים וְכַיּוֹצֵא בָּהֶן זֶה הַכִּסּוּי הַמֻּטָּל מִלְּמַעְלָה נִקְרָא גּוֹלֵל וְאֵלּוּ הַצְּדָדִין הַמַּעֲמִידִין אֶת הַגּוֹלֵל שֶׁהוּא נִשְׁעָן עֲלֵיהֶן נִקְרָאִין דּוֹפֵק. וּשְׁנֵיהֶם הַגּוֹלֵל אוֹ הַדּוֹפֵק מְטַמְּאִין בְּמַגָּע וּבְאֹהֶל כְּקֶבֶר וְטֻמְאָתָן מִדִּבְרֵי סוֹפְרִים וְאֵינָן מְטַמְּאִין בְּמַשָּׂא. לְפִיכָךְ אִם גָּרַר הַגּוֹלֵל בַּחֲבָלִים עַד שֶׁכִּסָּה בּוֹ אֶת הַמֵּת. אוֹ גְּרָרוֹ אוֹ שְׁמָטוֹ מֵעַל הַמֵּת… הֲרֵי זֶה טָהוֹר

English:

According to Scriptural Law, as long as the source of impurity is in a grave, the grave imparts impurity when it is touched or when one is under the same structure, as a corpse does, for Numbers 19:16 mentions touching “a corpse, the bone of a man, or a grave.”… If, however, one places keilim, stones, or the like at the side of a corpse and covers the corpse with keilim, stones, or the like, the covering that shelters the corpse from above is called a gollel. And the objects at the side that support the gollel and upon which it rests are called a dofek. Both of them, the gollel and the dofek impart impurity when they are touched or when one is under the same structure, as is true with regard to a grave. The impurity they impart is of Rabbinic origin. They do not impart impurity when carried. Accordingly, if one drags a gollel with ropes until it covers a corpse or drags it or pulls it away from being above a corpse, or one dragged a dofek until he positioned the gollel above it or pulled it by ropes from under the dofek, the person is pure.

Connection: Rabbi Shimon’s third case: contact and tent, but not carrying. The Rambam’s formulation is notable in two respects. First, he makes the exclusion from masa concrete and operational — dragging the cover into place with ropes, or hauling it off the corpse, leaves the person pure, because moving an object is masa and golel is exempt from masa. That is exactly the practical shape of “does not transmit by carrying.”

Second, the Rambam takes a position on the source: he rules that golel and dofek impart impurity midivrei sofrim, of rabbinic origin, whereas the grave itself is Scriptural. The daf presents the exclusion as halacha leMoshe miSinai; the Rambam’s classification of the underlying impurity as rabbinic is his own resolution, and the Kessef Mishneh discusses it at length.

Shulchan Aruch — Yoreh De’ah 369:1

Hebrew:

הַכֹּהֵן מוּזְהָר שֶׁלֹּא לִיטַּמֵּא בְּמֵת וְלֹא לְכָל טֻמְאוֹת הַפּוֹרְשׁוֹת מִמֶּנּוּ וְלֹא לְגוֹלֵל וְלֹא לְדוֹפֵק וְלֹא לְאֵבֶר מִן הַחַי שֶׁאֵין בּוֹ כְּדֵי לְהַעֲלוֹת אֲרוּכָה אִם הָיָה מְחֻבָּר… וְכֵן שָׂדֶה שֶׁנֶּחְרַשׁ בּוֹ קֶבֶר וְאֵין יָדוּעַ מְקוֹמוֹ וְכָל אֶרֶץ הָעַמִּים אָסוּר לַכֹּהֵן לִיטַּמֵּא בָּהֶן

English:

The Kohen is cautioned not to defile himself for a corpse, nor for all uncleannesses that emanate from it, nor for a gollel, nor for a dofek, nor for a limb severed from a living person that is not large enough to heal over were it still attached… and likewise a field in which a grave was plowed under and its location is unknown, and all the land outside the Land of Israel — it is forbidden for a Kohen to defile himself through them.

Connection: This is the one place where the daf’s material surfaces in practiced law. The Shulchan Aruch’s opening halacha on the impurity of a kohen names golel and dofek explicitly, alongside the corpse itself — precisely the third case of Rabbi Shimon’s baraita. A kohen must keep clear of a grave covering and its supporting walls exactly as he keeps clear of the corpse beneath. What the Shulchan Aruch does not do here is spell out the modes; that grid comes from the Rambam and, behind him, from this daf. The reader who wants to know how a kohen becomes impure through a golel — by touch and by overhang, but not by hauling it with ropes — must return to Tumat Met 2:15 and to Rabbi Shimon’s baraita on our amud.

Note also the Shulchan Aruch’s closing clause, concerning a plowed-over grave whose location is unknown. That is the practical setting in which the fine distinctions of this daf bite: scattered remains of unknown position, where whether a fragment transmits by contact, by carrying, or by overhang determines what a kohen may safely do.

Taken together, the three halachot complete Rabbi Shimon’s grid — each source missing exactly one mode, and each in a different column:

What Can Be Touched: The Sealed Thigh Bone

Source in Daf: 126b, Segments 5-10

The baraita reads benivlatah (Vayikra 11:39) as a restriction: impurity by contact applies only to what a person can actually touch in its entirety. A sealed kulit — a thigh bone whose marrow is enclosed within intact bone — is therefore pure, since the marrow inside cannot be reached. Perforate it, and it is impure. The Gemara then presses the principle with two objections: Rabbi Zeira asks about an animal still inside its hide (Abaye: count its natural orifices), and Rav Pappa about a kidney sealed in its fat (Rava: count the sinews running from kidney into fat). Rav Oshaya then asks whether merely intending to perforate suffices — and answers himself that it does.

Rambam — Hilchot She’ar Avot HaTumot 2:12 (intending to perforate)

Hebrew:

קוּלִית שֶׁחָשַׁב עָלֶיהָ לְנַקְּבָהּ וַעֲדַיִן לֹא נִקְּבָהּ הֲרֵי הַנּוֹגֵעַ בָּהּ סָפֵק טָמֵא. שֶׁהֲרֵי יֵשׁ בַּדָּבָר סָפֵק אִי מְחֻסַּר נְקִיבָה כִּמְחֻסַּר מַעֲשֶׂה אוֹ לֹא

English:

When a person thought of perforating a thigh bone, but had not done so as of yet, one who touches it contracts impurity of a doubtful status. For there is an unresolved question whether the fact that he has not perforated the bone as of yet is considered as not having carried out a significant deed or not.

Connection: This is Rav Oshaya’s dilemma, but the Rambam rules differently from the way the daf’s own resolution reads. The Gemara records Rav Oshaya raising the question and then resolving it himself — intention alone renders the bone impure. The Rambam declines to accept that self-resolution as decisive and codifies the case as safek tamei, doubtful impurity: one who touches such a bone is treated as impure by doubt, not as definitely impure. He frames the open question in its most general form — whether “lacking perforation” counts as “lacking an action” (mechusar nekivah kimchusar ma’aseh), a category that recurs across the laws of purity. In practice a safek ruling here means the stringencies of impurity are applied while the certainties are not.

Rambam — Hilchot She’ar Avot HaTumot 1:5 (the kidney in its fat)

Hebrew:

וְהַנּוֹגֵעַ בַּחֵלֶב הַחוֹפֶה אֶת הַכֻּלְיָא קֹדֶם הַפְרָשָׁה הֲרֵי זֶה טָמֵא כְּנוֹגֵעַ בַּכֻּלְיָא עַצְמָהּ שֶׁהֲרֵי כַּמָּה חוּטִין נִמְשָׁכִין מִמֶּנָּה בַּחֵלֶב

English:

Nevertheless, when one touches the fat that surrounds the kidney of a kosher domesticated animal that died without ritual slaughter before it was separated from the kidney, he is impure like one who touches the kidney itself. The rationale is that several strands of flesh from the kidney itself extend into the fat.

Connection: This is Rava’s answer to Rav Pappa, codified verbatim in its reasoning. Rav Pappa had objected that a kidney encased in its fat should be pure, since one cannot touch it — which would be an intolerable result. Rava replied that the sinews (chutin) running out from the kidney into the surrounding fat make the kidney reachable: touch the fat and you have effectively touched the kidney through its own extending strands. The Rambam adopts the reasoning word for word (shehare kamah chutin nimshachin mimenah bachelev) and states the practical consequence — one who touches the covering fat is impure exactly as one who touches the kidney. Note the qualification kodem hafrashah, before the fat has been separated; once detached, the connecting strands are severed and the analysis changes.

The Rambam’s treatment of the sealed bone in general — pure while sealed, impure once perforated — follows the same et she’efshar liga principle, and the required aperture is specified in the parallel case of the sheretz egg below.

The Sealed Egg of a Sheretz and the Hair-Width Perforation

Source in Daf: 126b, Segments 11-15

The new mishna rules that an egg of a sheretz (one of the eight creeping animals whose carcasses transmit impurity) in which the embryo has taken form is pure so long as the shell is sealed, and impure if perforated to any degree at all. The baraita derives both halves from the verse’s wording — hatteme’im and hasheretz — and the Gemara then fixes the measure of the perforation at k’chut hasa’ara, the width of a hair.

Rambam — Hilchot She’ar Avot HaTumot 4:10

Hebrew:

בֵּיצַת הַשֶּׁרֶץ הַמְרֻקֶּמֶת אַף עַל פִּי שֶׁהַשֶּׁרֶץ נִרְאֵית מִתּוֹכָהּ טְהוֹרָה. נִקְּבָה כָּל שֶׁהוּא הַנּוֹגֵעַ בָּהּ טָמֵא

English:

An egg of a sheretz in which the embryo has begun to take form is pure, even though the embryonic sheretz can be seen within it. If it is perforated to the slightest degree, one who touches it is impure.

Connection: The Rambam codifies the mishna precisely, including its most counterintuitive feature — the egg is pure even though the sheretz can be seen through the shell (af al pi shehasheretz nir’et mitochah). Visibility is not contact. What renders the creature touchable, and therefore a source of impurity, is an actual opening, and the Rambam holds to the mishna’s standard of kol shehu, the slightest perforation.

He does not, however, quote the Gemara’s hair-width measure (k’chut hasa’ara) in this halacha; his kol shehu is the operative formulation, with the Gemara’s hair-width serving as the practical specification of what “the slightest degree” means. The two are not in tension — a hair’s width is simply how Chazal quantified the minimum aperture that makes the interior reachable.

The Half-Earth Mouse and the Sea Mouse

Source in Daf: 126b, Segments 16-20

The daf discusses a creature described as half flesh and half earth, and Rabbi Yehoshua ben Levi’s condition regarding whether the sheretz form has spread over its whole extent (hishritz al penei kulo). It then treats the achbar shebayam, the sea mouse, which a derasha from al ha’aretz excludes from the impurity of sheratzim, limiting that impurity to land species.

Rambam — Hilchot She’ar Avot HaTumot 4:11

Hebrew:

שֶׁרֶץ שֶׁחֶצְיוֹ בָּשָׂר וְחֶצְיוֹ אֲדָמָה הַנּוֹגֵעַ בַּבָּשָׂר טָמֵא וּבָאֲדָמָה טָהוֹר. וְאִם הִשְׁרִיץ עַל פְּנֵי כֻּלּוֹ אַף הַנּוֹגֵעַ בָּאֲדָמָה שֶׁעֲדַיִן לֹא נִגְמְרָה צוּרָתוֹ טָמֵא

English:

The following laws apply with regard to the carcass of a sheretz that is half flesh and half earth. If one touched the flesh, he is impure. If he touched the earth, he is pure. If the form of the sheretz was already apparent over its entire length, even one who touches the earth that has not yet been formed into a sheretz is impure.

Connection: The Rambam rules exactly as the daf presents the case, adopting Rabbi Yehoshua ben Levi’s qualification as the operative distinction. The default rule tracks the visible division: the flesh half transmits, the earth half does not. But once the sheretz form has spread over the creature’s full extent (hishritz al penei kulo), the whole is treated as a unit, and even the portion whose form is not yet complete transmits impurity on contact.

Rambam — Hilchot She’ar Avot HaTumot 4:1 (which creatures are sheratzim)

Hebrew:

שְׁמוֹנָה שְׁרָצִים הָאֲמוּרִין בַּתּוֹרָה. וְהֵן הַחֹלֶד וְהָעַכְבָּר וְהַצָּב וְהָאֲנָקָה וְהַלְּטָאָה וְהַכֹּחַ וְהַתִּנְשֶׁמֶת וְהַחֹמֶט. טֻמְאַת כֻּלָּן שָׁוָה וְהֵן הַנִּקְרָאִין שֶׁרֶץ לְעִנְיַן טֻמְאָה

English:

The eight crawling animals that are mentioned in the Torah are: the weasel, the mouse, the ferret, the hedgehog, the chameleon, the lizard, the snail, and the mole. The impurity of them all is the same. They are each referred to as a sheretz with regard to impurity.

Connection: The Rambam fixes the closed list of eight, and states that their impurity is uniform. This is the frame within which the daf’s achbar shebayam derasha operates: the Gemara reads al ha’aretz as restricting the achbar of the verse to the land species, so that a sea creature bearing the same name falls outside the list of eight entirely and does not transmit sheretz impurity. The Rambam’s list names the achbar without qualification here; the limitation to land species is the Gemara’s contribution, and it functions as a boundary on how far the name in the verse extends.

The underlying logic connects this section back to the two before it. In each case the question is what counts as a single, complete, touchable entity: the scattered dust that cannot be touched as a whole, the sealed bone whose interior is unreachable, the intact egg, and here the creature whose form has or has not yet extended across its full body.

A Note on Practice Today

Most of this daf’s law is not operative, because the laws of ritual purity depend on the Temple and on the ashes of the red heifer. The Shulchan Aruch therefore has no parallel section on rakav, on the sealed kulit, on the sheretz egg, or on the half-earth creature — these appear in the Rambam because he codified the entire corpus including the laws awaiting the Temple’s rebuilding, not because they are practiced.

The one area that remains fully live is the corpse-impurity of a kohen, treated in Yoreh De’ah 369-372. The grid of Topic A governs that practice directly. Because a single bone is excluded from ohel, a kohen is not rendered impure by an overhang above an isolated barley-grain bone — but touching or moving it does render him impure. Because golel and dofek are excluded from masa, a kohen who shifts a grave covering by rope is not thereby made impure by carrying, though touching it or standing beneath its shelter is another matter. And because rakav is excluded from maga but transmits by ohel, decomposed remains beneath a structure are a concern of overhang rather than contact. These are the distinctions that structure real questions about cemeteries, excavation sites, and construction near known graves.

Summary of Rulings