Exodus 34:18-20

Complete Jewish Bible

¹⁸ “Keep the festival of matzah by eating matzah, as I ordered you, for seven days during the month of Aviv; for it was in the month of Aviv that you came out from Egypt.

¹⁹ “Everything that is first from the womb is mine. Of all your livestock, you are to set aside for me the males, the firstborn of cattle and flock. ²⁰ The firstborn of a donkey you must redeem with a lamb; if you won’t redeem it, break its neck. All the firstborn of your sons you are to redeem, and no one is to appear before me empty-handed.