Exodus 34:19 in the King James Version
All that openeth the matrix is mine; and every firstling among thy cattle, whether ox or sheep, that is male.
Context
18 “You shall keep the feast of unleavened bread. Seven days you shall eat unleavened bread, as I commanded you, at the time appointed in the month Abib; for in the month Abib you came out of Egypt.
19 “All that opens the womb is mine; and all your livestock that is male, the firstborn of cow and sheep.
20 You shall redeem the firstborn of a donkey with a lamb. If you will not redeem it, then you shall break its neck. You shall redeem all the firstborn of your sons. No one shall appear before me empty.