it is in a case where one had a critically ill person in his household while it was still day, before Shabbat, as it is permitted to slaughter the animal for such a person even on Shabbat. Therefore, the unslaughtered animal was not set aside from use.

The Gemara asks: If so, what is the reason that Rabbi Yehuda prohibited consumption of the meat on Shabbat? The Gemara answers: He issued this ruling in a case where one had a critically ill person in his household before Shabbat and that person recovered. In that case, although the unslaughtered animal was not set aside from use when Shabbat began, it is prohibited to slaughter it on Shabbat. According to Rabbi Yehuda, if he slaughtered it unwittingly, its consumption is prohibited on Shabbat.

And that which Rav silenced the tanna for not stating that an unslaughtered animal is set aside from use, even when the prohibited labor of slaughter was performed unwittingly, is in accordance with that which Rav Aḥa bar Adda says that Rav says, and some say it is that which Rabbi Yitzḥak bar Adda says that Rav says: In the case of one who slaughters an animal to feed an ill person on Shabbat, it is prohibited for a healthy person to partake of the slaughtered animal on Shabbat. In a case of one who cooks food to feed an ill person on Shabbat, it is permitted for a healthy person to partake of that food.

What is the reason for this distinction? This food was fit to be chewed before it was cooked, and therefore it was not set aside from use when Shabbat began, and the meat of that animal was not fit to be chewed before the animal was slaughtered, and therefore it was set aside from use when Shabbat began.

Rav Pappa says: There are times when one slaughters for an ill person on Shabbat and it is permitted for a healthy person to eat the meat on Shabbat, such as where he had a critically ill person in his household before Shabbat and the animal was designated for slaughter while it was still day, before Shabbat; in that case, it was not set aside from use. And there are times when one cooks on Shabbat for an ill person and it is prohibited for a healthy person to eat the food on Shabbat, such as where one cut a gourd that was attached to the ground for the ill person on Shabbat. Because it is prohibited to detach the gourd on Shabbat, it is set aside from use and forbidden.

Rav Dimi of Neharde’a says that the halakha is: In the case of one who slaughters for an ill person on Shabbat, it is permitted for a healthy person to eat the raw meat [be’umtza]. What is the reason that it is permitted? Since it is impossible for an olive-bulk of meat to be permitted without slaughter of the entire animal, when he slaughters the animal, he slaughters it with the ill person in mind. Since slaughter of the animal was permitted, all its meat is permitted even for a healthy person. In the case of one who cooks for an ill person on Shabbat, it is prohibited for a healthy person to eat the food on Shabbat. What is the reason that it is prohibited? It is due to a rabbinic decree lest he increase the amount of food that he is cooking on behalf of the healthy person.

MISHNA: In the case of one who slaughters an animal with the smooth side of a hand sickle, which has both a smooth and a serrated side, or with a sharpened flint, or with a reed that was cut lengthwise and sharpened, his slaughter is valid.

All slaughter [hakkol shoḥatin], and one may always slaughter, and one may slaughter with any item that cuts, except for the serrated side of the harvest sickle, a saw, the teeth of an animal when attached to its jawbone, and a fingernail, because they are serrated and they consequently strangle the animal and do not cut its windpipe and gullet as required.

GEMARA: The Gemara notes that the language of the mishna, which states: One who slaughters an animal with a hand sickle, with a flint, or with a reed, rather than: One may slaughter, indicates that after the fact, yes, the slaughter is valid, but one may not slaughter with those blades ab initio. The Gemara asks: Granted, one may not slaughter it with a hand sickle, lest he come to perform the slaughter with the other, serrated, side; but as a flint and a reed have no serrated side, is it so that one may not slaughter with those ab initio? And the Gemara raises a contradiction from a baraita: One may slaughter with any item that cuts, whether with a flint, or with glass shards, or with the stalk of a reed.

The Gemara answers: This is not difficult. There, where the baraita permits slaughter ab initio, it is referring to slaughter with a flint and a reed when they are detached. Here, where the mishna says that the slaughter is valid only after the fact, it is referring to slaughter with a flint and a reed when they are attached to the ground, as Rav Kahana says: In the case of one who slaughters with a blade that is attached to the ground, Rabbi Yehuda HaNasi deems the slaughter not valid and Rabbi Ḥiyya deems it valid. The Gemara infers: Even Rabbi Ḥiyya deems the slaughter valid only after the fact; but one may not do so ab initio.

In accordance with which opinion did you interpret the mishna? Is it in accordance with the opinion of Rabbi Ḥiyya, and the slaughter is valid after the fact? But if so, with regard to that which is taught in a baraita: One may slaughter with any item that cuts, whether with a blade that is detached from the ground or with a blade that is attached to the ground, whether the knife is above and the neck of the animal is below or the knife is below and the neck of the animal is above; in accordance with whose opinion is it? It is in accordance neither with the opinion of Rabbi Yehuda HaNasi nor with the opinion of Rabbi Ḥiyya. If one would claim that it is in accordance with the opinion of Rabbi Ḥiyya, he says: After the fact, yes, the slaughter is valid, but it is not permitted to slaughter in this manner ab initio. If one would claim that it is in accordance with the opinion of Rabbi Yehuda HaNasi, he says: Even after the fact, the slaughter is not valid.

The Gemara answers: Actually, the baraita is in accordance with the opinion of Rabbi Ḥiyya, and he permits slaughter with these blades even ab initio. And the fact that the opinions of Rabbi Yehuda HaNasi and Rabbi Ḥiyya were formulated such that they disagree concerning the halakha after the fact is to convey to you the far-reaching nature of the opinion of Rabbi Yehuda HaNasi that the slaughter is not valid even after the fact.

But rather, the mishna here, which teaches: With regard to one who slaughters, after the fact, yes, it is valid, but it is not ab initio, in accordance with whose opinion is it? It is in accordance neither with the opinion of Rabbi Yehuda HaNasi nor with the opinion of Rabbi Ḥiyya. If one would claim that it is in accordance with the opinion of Rabbi Ḥiyya, he says: The slaughter is permitted even ab initio. If one would claim that it is in accordance with the opinion of Rabbi Yehuda HaNasi, he says: Even after the fact, the slaughter is not valid.

The Gemara answers: Actually, Rabbi Ḥiyya holds that it is permitted to slaughter with these blades, and even ab initio; and the mishna here, which teaches: One who slaughters, is in accordance with the opinion of Rabbi Yehuda HaNasi.

The Gemara objects: This is difficult, as there is a contradiction between one statement of Rabbi Yehuda HaNasi and another statement of Rabbi Yehuda HaNasi, as in his dispute with Rabbi Ḥiyya he holds that the slaughter is not valid. The Gemara answers: This contradiction is not difficult. There, in his dispute with Rabbi Ḥiyya, Rabbi Yehuda HaNasi holds that slaughter is not valid in a case where the blade was attached from the outset; here, in the mishna, Rabbi Yehuda HaNasi deems the slaughter valid after the fact in a case where the blade was detached and ultimately he reattached it.

The Gemara asks: And from where do you say that there is a difference for us between a blade that was attached from the outset and a blade that was detached and ultimately he reattached it? As it is taught in a baraita: With regard to one who slaughters with a mechanism [bemukhni] of a wheel with a knife attached to it, his slaughter is valid; with an item that is attached to the ground, his slaughter is valid; if one embedded a knife in a wall and slaughtered with it, his slaughter is valid. If there was a flint emerging from a wall or a reed arising from the ground on its own and he slaughtered with it, his slaughter is not valid.