Exodus 13:11-13

Wycliffe Bible

¹¹ And when the Lord hath brought thee into the land of Canaanites, as he swore to thee, and to thy fathers, and hath given it to thee,

¹² thou shalt separate to the Lord all thing (of male kind) that (first) openeth the womb, and that that is first in thy beasts (thou shalt set aside for the Lord all the males who first openeth the womb, and all the males that be first in thy beasts); whatever thing thou hast of male kind, thou shalt hallow it to the Lord.

¹³ Thou shalt (ex)change the first engendered of an ass for a sheep, that if thou again-buyest it not, thou shalt slay it; forsooth thou shalt again-buy with price all the first begotten of a man of thy sons. (Thou shalt exchange the first-born of a donkey for a sheep, and if thou buyest it not back, then thou shalt kill it; but thou must buy back all thy first-born sons.)