Chulin 9:7-8

Chulin 9:7

If a limb or flesh of an animal is hanging loose (i.e., mostly but not completely severed), it is susceptible to the ritual impurity of food where it is but it must be prepared to accept this impurity (by becoming wet from an appropriate liquid). Rabbi Meir says that if the animal is slaughtered, it is rendered susceptible to ritual impurity by its blood; Rabbi Shimon disagrees. If the animal dies, the flesh must be prepared to accept impurity. The limb transmits the ritual impurity of a limb severed from a living animal but it doesn’t transmit the ritual impurity of a limb from a neveila; this is the opinion of Rabbi Meir. Rabbi Shimon declares it ritually pure.

Chulin 9:8

A limb or flesh hanging loose from a human being is ritually pure. If this person dies, that flesh is ritually pure (considered to have been separated from him before his death). Such a limb transmits the ritually impurity of a limb severed from a living person but it doesn’t transmit the ritual impurity of a limb severed from a corpse; this is the opinion of Rabbi Meir. Rabbi Shimon declares it ritually pure.