Exodus 13:8-10

And thou shalt shew thy sonne in that day, saying, This is done, because of that which the Lord did vnto me, when I came out of Egypt.

And it shalbe a signe vnto thee vpon thine hande, and for a remembrance betweene thine eyes, that the Lawe of the Lord may be in thy mouth: for by a strong hand the Lord brought thee out of Egypt.

Keepe therefore this ordinance in his season appoynted from yeere to yeere.