Exodus 13:2

2 aConsecrate to me all the firstborn. Whatever is the first to open the womb among the people of Israel, both of man and of beast, is mine.”

Exodus 13:12

12 byou shall set apart to the Lord all that first opens the womb. All the firstborn of your animals that are males shall be the Lord’s.

Exodus 13:15

15For when Pharaoh stubbornly refused to let us go, the cLord killed all the firstborn in the land of Egypt, both the firstborn of man and the firstborn of animals. Therefore I sacrifice to the Lord all the males that first open the womb, but dall the firstborn of my sons I redeem.’
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