Mishnayos Chullin Perek 4 Mishnah 4

If an animal was encountering difficulty giving birth and as a result the fetus extended its foreleg outside the mother’s womb, and someone severed it and afterward slaughtered the mother animal, the flesh of the fetus is ritually pure. If one first slaughtered the mother animal and afterward severed the foreleg, the flesh of both the mother animal and the fetus are ritually impure due to having been in contact with a carcass. Since the foreleg was not permitted to be consumed through the act of slaughtering, it is regarded as a carcass with the associated ritual impurity. The rest of the flesh, which was permitted to be consumed by the slaughter, was in contact with it and so was rendered ritually impure from it; this is the statement of Rabbi Meir. And the Rabbis say: The flesh has the ritual impurity of having been in contact with a tereifa that was slaughtered, as the limb is regarded as a tereifa that was slaughtered. By Torah law, although it is prohibited to consume it, it does not impart ritual impurity. Nevertheless, the Sages decreed that a tereifa that was slaughtered, as well as anything that comes in contact with it, is regarded as ritually impure to the extent that it disqualifies sacrificial foods that come in contact with it. The Rabbis explain the rationale behind their opinion: Just as we found in the case of a tereifa that its slaughter renders it ritually pure according to Torah law, i.e., ritual slaughter prevents it from having the ritual impurity of a carcass despite not rendering the animal permitted for consumption, so too, the slaughter of the mother animal should render the limb of its fetus that left the womb ritually pure, despite the fact that its consumption is prohibited. Rabbi Meir said to them: No, if the slaughter of a tereifa renders the body of the animal ritually pure, it is because the slaughter is performed on something that is part of its body, i.e., its throat. Does it necessarily follow that you should also render the limb that left the womb pure, given that it is something that is not part of the mother’s body? Certainly not. The mishna asks: From where is it derived with regard to a tereifa that its slaughter renders it ritually pure, i.e., prevents it from having the ritual impurity of a carcass? The mishna notes there is a reason to say the slaughter should not render it pure, as one can compare a tereifa with a non-kosher animal: A non-kosher animal is prohibited for consumption; so too, a tereifa is prohibited for consumption. Therefore, conclude: Just as with regard to a non-kosher animal, its slaughter does not render it ritually pure, so too with regard to a tereifa, its slaughter should not render it ritually pure. The mishna questions the comparison: No, if you said that slaughtering cannot prevent an animal from having the ritual impurity of a carcass in the case of a non-kosher animal, which is distinct in that it did not have a period of potential fitness when slaughtering it could have rendered its consumption permitted, does it necessarily follow that you should also say this in the case of a tereifa, which did have a period of potential fitness? Perhaps, since the animal had a period of potential fitness its slaughter remains effective in preventing it from having the ritual impurity of a carcass. The mishna rejects this distinction: Take back to yourself this claim that you brought, as it is insufficient. What about a case where an animal was born as a tereifa from the womb, and so it never had a period of potential fitness? For such a case, from where is it derived that its slaughter renders it ritually pure? The mishna reformulates the distinction: No, if you say that slaughtering cannot prevent a prohibited animal from having the ritual impurity of a carcass with regard to a non-kosher animal, which is distinct in that there are no animals of its kind that are permitted through slaughtering, as the Torah states the concept of slaughtering only with regard to kosher animals, does it necessarily follow that you should also say this with regard to a tereifa kosher animal, given that there are other animals of its kind that are permitted through slaughtering, i.e., kosher animals that are not tereifa? Perhaps, since the concept of slaughtering is relevant to that kind of animal it can serve to prevent the animal from having the ritual impurity of a carcass even if the slaughter cannot render it permitted for consumption. The mishna notes: Based on this reasoning, one must conclude that with regard to an eight-month-old fetus that was born alive, slaughter does not render it ritually pure, as there are no animals of its kind that are permitted through slaughtering. The Torah applies the concept of slaughter only with regard to animals that were born full term.

בְּהֵמָה הַמַּקְשָׁה לֵילֵד, וְהוֹצִיא עֻבָּר אֶת יָדוֹ וַחֲתָכָהּ וְאַחַר כָּךְ שָׁחַט אֶת אִמּוֹ, הַבָּשָׂר טָהוֹר. שָׁחַט אֶת אִמּוֹ וְאַחַר כָּךְ חֲתָכָהּ, הַבָּשָׂר מַגַּע נְבֵלָה, דִּבְרֵי רַבִּי מֵאִיר. וַחֲכָמִים אוֹמְרִים, מַגַּע טְרֵפָה שְׁחוּטָה. מַה מָּצִינוּ בַטְּרֵפָה שֶׁשְּׁחִיטָתָהּ מְטַהַרְתָּהּ, אַף שְׁחִיטַת בְּהֵמָה תְּטַהֵר אֶת הָאֵבָר. אָמַר לָהֶם רַבִּי מֵאִיר, לֹא, אִם טִהֲרָה שְׁחִיטַת טְרֵפָה אוֹתָהּ, דָּבָר שֶׁגּוּפָהּ, תְּטַהֵר אֶת הָאֵבָר, דָּבָר שֶׁאֵינוֹ גוּפָהּ. מִנַּיִן לַטְּרֵפָה שֶׁשְּׁחִיטָתָהּ מְטַהַרְתָּהּ. בְּהֵמָה טְמֵאָה אֲסוּרָה בַאֲכִילָה, אַף טְרֵפָה אֲסוּרָה בַאֲכִילָה. מַה בְּהֵמָה טְמֵאָה אֵין שְׁחִיטָתָהּ מְטַהַרְתָּהּ, אַף טְרֵפָה לֹא תְטַהֲרֶנָּה שְׁחִיטָתָהּ. לֹא, אִם אָמַרְתָּ בִּבְהֵמָה טְמֵאָה שֶׁלֹּא הָיְתָה לָהּ שְׁעַת הַכֹּשֶׁר, תֹּאמַר בִּטְרֵפָה שֶׁהָיְתָה לָהּ שְׁעַת הַכֹּשֶׁר. טֹל לְךָ מַה שֶּׁהֵבֵאתָ, הֲרֵי שֶׁנּוֹלְדָה טְרֵפָה מִן הַבֶּטֶן מִנַּיִן. לֹא, אִם אָמַרְתָּ בִּבְהֵמָה טְמֵאָה שֶׁכֵּן אֵין בְּמִינָהּ שְׁחִיטָה, תֹּאמַר בִּטְרֵפָה שֶׁיֵּשׁ בְּמִינָהּ שְׁחִיטָה. בֶּן שְׁמֹנָה חַי, אֵין שְׁחִיטָתוֹ מְטַהַרְתּוֹ, לְפִי שֶׁאֵין בְּמִינוֹ שְׁחִיטָה: