Chulin 7:1-2

Chulin 7:1

The law of gid hanasheh (not to eat the sciatic nerve) applies both in Israel and elsewhere, when the Temple is standing and when it isn’t, to both secular food and sacrifices. It applies to both domesticated and wild animals, to both the right and the left thigh. The law of gid hanasheh does not apply to birds because they have no hollow of the thigh. This law applies to a fetus taken from a slaughtered animal, though Rabbi Yehuda says that it doesn’t and that the fetus’ cheilev fats are also permitted. Rabbi Meir says that butchers are not believed about removing the gid hanasheh but the Sages say that they are believed, both about the gid hanasheh and the cheilev fats.

Chulin 7:2

One may send a non-Jew the gift of a thigh that still contains the gid hanasheh because the location of this sinew is known. When removing the gid hanasheh, he must remove it all; Rabbi Yehuda says he must remove enough to fulfill the obligation to remove it.