Exodus 13:12-15 you shall set apart to Jehovah every one that opens the womb, and every first-born that comes of any animal which you have; the males shall be Jehovah's.

MKJV⁽ⁱ⁾ ¹² you shall set apart to Jehovah every one that opens the womb, and every first-born that comes of any animal which you have; the males shall be Jehovah's. ¹³ And every first-born of an ass you shall redeem with a lamb. And if you will not redeem it, then you shall break its neck. And all the first-born of man among your sons you shall redeem. ¹⁴ And it shall be when your sons asks you in time to come, saying, What is this? you shall say to him, Jehovah brought us out of Egypt by the strength of His hand, from the house of bondage. ¹⁵ And it happened when Pharaoh hardened himself against sending us, Jehovah killed all the first-born of the land of Egypt, both the first-born of man, and the first-born of animals. Therefore I sacrifice to Jehovah all that opens the womb, that are males. But all the first-born of my sons I redeem.