One who buys the fetus of a donkey belonging to a non-Jew, or sells [one] to him, even though it is not permissible, or he enters into a partnership with him, or he receives [a donkey] from him to hold, or gives [one] to him to hold, is exempt from the bechor laws, as it is stated (Numbers 3:13): in Israel —- but not in others.  [The donkeys of] Kohanim and Leviim are exempt because of a kal vachomer: If they exempted the Yisraelim in the Desert, it is only proper that they should exempt their own.

[If] a cow bore something resembling a donkey, or [if] a donkey bore something resembling a horse, it is exempt from bechor laws; as it is stated (Exodus 13:13, 34:20): The firstborn of a donkey, The firstborn of a donkey, twice —- until the bearer is a donkey and the offspring is a donkey.  What is their status in regard to eating? [If] a kosher animal bore something resembling an unkosher animal, it is permissible for eating; but [if] an unkosher animal bore something resembling a kosher animal, it is forbidden for eating; for whatever comes out of something unkosher is unkosher, and whatever comes out of something kosher is kosher. [If] an unkosher fish swallowed a kosher fish, the kosher fish is permissible for eating; but [if] a kosher one swallowed an unkosher fish, it is prohibited for eating, because this is not its growth.

[If] a donkey which had not yet given birth bore two males —- he must give one lamb to a Kohen; [if it bore] a male and a female —- he must set aside one [lamb] for himself. [If] two donkeys which had not yet given birth bore two males —- he must give two lambs to a Kohen; [if they bore] a male and a female, or two males and a female —- he must give one lamb to a Kohen; [if] two females and a male, or two males and two females —- there is nothing here for a Kohen.

[If] a [donkey] which had previously given birth and one which had not yet given birth [now] bore two males —- he must give one lamb to a Kohen; [if they bore] a male and a female —- he must set aside one lamb for himself.  As it states (Exodus 34:20): The firstborn of a donkey you shall redeem with a seh —- [it may be] of sheep or goats, a male or a female, old or young, perfect or blemished. He may redeem with it many times; it enters the pen to be tithed; and if it dies, one may derive benefit from it.