"Sanctify to me all of the firstborn, whatever opens the womb among the children of Israel, both of man and of animal. It is mine."

that you shall set apart to the LORD all that opens the womb, and every firstborn which you have that comes from an animal. The males shall be the LORD's.

and it happened, when Pharaoh would hardly let us go, that the LORD killed all the firstborn in the land of Egypt, both the firstborn of man, and the firstborn of animal. Therefore I sacrifice to the LORD all that opens the womb, being males; but all the firstborn of my sons I redeem.'

All that opens the womb is mine; and all your livestock that is male, the firstborn of cow and sheep.