Exodus 13:8-10

8On that day, you must tell your children the reason for this festival. Tell them, “We do this because of what the Lord did for us. He brought us out of Egypt.”

9This special time will be like a mark on your hand. It will be like something that you fix between your eyes. It will be a sign that causes you to remember what happened on this day. Then you will not forget to speak about the Law of the Lord. Remember this: The Lord brought you out of Egypt with his great power.

10Every year, at the right time you must do what I have said.