[The prohibition against eating] the sinew of the thigh applies [both] in the Land and outside the Land, when the Temple exists and when the Temple does not exist, to unconsecrated animals and to consecrated ones, and it applies to an animal and to a beast, to the right thigh and to the left thigh, but it does not apply to a fowl because it has no spoon-shaped hip. And it applies to a fetus. R’ Yehudah says: It does not apply to a fetus. And its fat is permissible. Butchers are not believed concerning the sinew of the thigh, these are the words of R’ Meir; but the Sages say: They are believed concerning it and concerning fat.