Exodus 13:8-10

Revised Standard Version

⁸ And you shall tell your son on that day, ‘It is because of what the Lord did for me when I came out of Egypt.’ ⁹ And it shall be to you as a sign on your hand and as a memorial between your eyes, that the law of the Lord may be in your mouth; for with a strong hand the Lord has brought you out of Egypt. ¹⁰ You shall therefore keep this ordinance at its appointed time from year to year.