Exodus 13:5-9

5And it shall be when the LORD shall bring thee into the land of the Canaanites, and the Hittites, and the Amorites, and the Hivites, and the Jebusites, which he swore to thy fathers to give thee, a land flowing with milk and honey, that thou shalt keep this service in this month.

6Seven days shalt thou eat unleavened bread, and in the seventh day shall be a feast to the LORD.

7Unleavened bread shall be eaten seven days; and there shall no leavened bread be seen with thee, neither shall there be leaven seen with thee in all thy quarters.

8And thou shalt show thy son in that day, saying, This is done because of that which the LORD did to me when I came forth out of Egypt.

9And it shall be for a sign to thee upon thy hand, and for a memorial between thy eyes, that the LORD’S law may be in thy mouth: for with a strong hand hath the LORD brought thee out of Egypt.