Exodus 13:8-12

And you shall tell your son on that day, saying, ‘It is because of what the Lord did for me when I came out of Egypt.’

And it shall serve as a sign to you on your hand, and as a reminder on your forehead, that the law of the Lord may be in your mouth; for with a powerful hand the Lord brought you out of Egypt.

Therefore, you shall keep this ordinance at its appointed time from year to year.

“Now when the Lord brings you to the land of the Canaanite, as He swore to you and to your fathers, and gives it to you,

you shall devote to the Lord every firstborn of a womb, and every firstborn offspring of an animal that you own; the males belong to the Lord.