Exodus 13:11-13 Douay-Rheims 1899 American Edition (DRA)
11 And when the Lord shall have brought thee into the land of the Chanaanite, as he swore to thee and thy fathers, and shall give it thee:
12 Thou shalt set apart all that openeth the womb for the Lord, and all that is first brought forth of thy cattle: whatsoever thou shalt have of the male sex, thou shalt consecrate to the Lord.
13 The firstborn of an ass thou shalt change for a sheep: and if thou do not redeem it, thou shalt kill it. And every firstborn of men thou shalt redeem with a price.