Exodus 34:16-20

and you might take some of his daughters for your sons, and his daughters might prostitute themselves with their gods and cause your sons also to prostitute themselves with their gods.

You shall not make for yourself any gods cast in metal.

“You shall keep the Feast of Unleavened Bread. For seven days you are to eat unleavened bread, as I commanded you, at the appointed time in the month of Abib; for in the month of Abib you came out of Egypt.

“The firstborn from every womb belongs to Me, and all your male livestock, the firstborn from cattle and sheep.

You shall redeem with a lamb the firstborn from a donkey; and if you do not redeem it, then you shall break its neck. You shall redeem all the firstborn of your sons. None are to appear before Me empty-handed.