Exodus 13:10

8You shall tell your son in that day, saying, ‘It is because of that which the LORD did for me when I came out of Egypt.’

9It shall be for a sign to you on your hand, and for a memorial between your eyes, that the LORD’s law may be in your mouth; for with a strong hand the LORD has brought you out of Egypt.

10You shall therefore keep this ordinance in its season from year to year.

11“It shall be, when the LORD brings you into the land of the Canaanite, as he swore to you and to your fathers, and will give it to you,

12that you shall set apart to the LORD all that opens the womb, and every firstborn that comes from an animal which you have. The males shall be the LORD’s.