Nedarim 4:2-3

Nedarim 4:2

If one is prohibited by a vow from benefitting from his friend, the friend may still pay his annual shekel to the Temple, he may repay a debt for him and he may return a lost possession to him. In a place where one pays for the return of a lost item, if the friend declines the reward, the money is donated to the Temple.

Nedarim 4:3

The friend may separate tithes for the one who vowed with his consent, he may offer the bird sacrifices for bodily discharges and childbirth for him (or her), he may offer sin offerings and guilt offerings for him, and he may teach him Midrash, halacha and aggada. The friend may not, however, teach him the written Torah (since one would normally charge a fee for this service and the one who vowed would benefit from it being waived). The friend may teach the sons and daughters of the one who vowed. The friend may support the wife and children of the one who vowed even though doing so is his obligation. The friend may not support the animal of the one who vowed, neither a kosher animal nor an unkosher animal; Rabbi Eliezer says the friend may feed an unkosher animal but not a kosher animal. The Sages asked Rabbi Eliezer the difference between kosher and unkosher animals; he replied that a kosher animal’s life belongs to God but its body belongs to its owner (i.e., he can eat it), while a nonkosher animal belongs to God “body and soul” (i.e., the owner derives no benefit from the animal after its death). The Sages responded that even in the case of an unkosher animal, its life belongs to God and its body belongs to the owner because he can sell it to non-Jews or feed it to his dogs.