Exodus 34:18-20

Amplified Bible, Classic Edition

¹⁸ The Feast of Unleavened Bread you shall keep. Seven days you shall eat unleavened bread, as I commanded you, in the time of the month of Abib; for in the month of Abib you came out of Egypt.

¹⁹ All the males that first open the womb among your livestock are Mine, whether ox or sheep.

²⁰ But the firstling of a donkey [an unclean beast] you shall redeem with a lamb or kid, and if you do not redeem it, then you shall break its neck. All the firstborn of your sons you shall redeem. And none of you shall appear before Me empty-handed.