[The prohibition of] the sciatic nerve is in force both within the land and outside it, both during the existence of the Temple and after it, in respect of both unconsecrated and consecrated [animals]. It applies to cattle and to wild animals, to the right and left hip. But it does not apply to a bird because it does not have a socket [on its hip]. It applies to a fetus. Rabbi Judah says: it does not apply to a fetus. And its [forbidden] fat is permitted. Butchers are not trustworthy with regard to the [removal of the] sciatic nerve, the words of Rabbi Meir. The sages say: they are trustworthy with regard to it as well as with regard to the [forbidden] fat.

One may send to a non-Jew a thigh in which the sciatic nerve has not been removed, because its place is known. When a person removes the sciatic nerve he must remove all of it. Rabbi Judah says: only so much as is necessary to fulfill the mitzvah of removing it.

If a thigh was cooked together with the sciatic nerve and there was enough [of the nerve] as to impart a flavor [to the thigh], it is forbidden. How does one measure this? As if it were meat [cooked] with turnips.

A sciatic nerve which was cooked with other [permitted] nerves: If it can still be recognized, [then all the nerves are prohibited] if [the sciatic nerve] imparts a flavor. But if it can no longer [be recognized] then they are all forbidden. And the broth [is prohibited] if it [the sciatic nerve] imparts a flavor. And so it is with a piece of nevelah, or a piece of an unclean fish that was cooked together with other pieces of flesh [or fish]: If it can still be recognized, [then all are prohibited] if it imparts a flavor. But if it can no longer [be recognized] then they are all forbidden. And the broth [is prohibited] if it [the sciatic nerve] imparts a flavor.

It applies to clean animals but not to unclean. Rabbi Judah says, even to unclean animals. Rabbi Judah said: was not the sciatic nerve prohibited from the time of the sons of Jacob, and at that time unclean animals were still permitted to them? They replied, this law was ordained at Sinai but was written in its proper place.