Exodus 13:11-13

11And it shall be when the LORD shall bring thee into the land of the Canaanites, as he swore to thee and to thy fathers, and shall give it to thee, 12That thou shall set apart to the LORD all that openeth the womb, and every firstling that cometh of a beast which thou hast; the males shall be the LORD’S.1 13And every firstling of a donkey thou shalt redeem with a lamb; and if thou wilt not redeem it, then thou shalt break his neck: and all the firstborn of man among thy children shalt thou redeem.2