Exodus 13:14

¹²that thou shalt set apart every offspring opening the womb, the males to the Lord, every one that opens the womb out of the herds or among thy cattle, as many as thou shalt have: thou shalt sanctify the males to the Lord.

¹³Every offspring opening the womb of the ass thou shalt change for a sheep; and if thou wilt not change it, thou shalt redeem it: every firstborn of man of thy sons shalt thou redeem.

— Exodus 13:14 —

¹⁵And when Pharaoh hardened his heart so as not to send us away, he slew every firstborn in the land of Egypt, both the firstborn of man and the firstborn of beast; therefore do I sacrifice every offspring that opens the womb, the males to the Lord, and every firstborn of my sons I will redeem.

¹⁶And it shall be for a sign upon thy hand, and immovable before thine eyes, for with a strong hand the Lord brought thee out of Egypt.