Exodus 13:6

3 And Moses said to the people: Remember this day in which you came forth out of Egypt, and out of the house of bondage, for with a strong hand hath the Lord brought you forth out of this place: that you eat no leavened bread.

4 This day you go forth in the month of new corn.

5 And when the Lord shall have brought thee into the land of the Chanaanite, and the Hethite, and the Amorrhite, and the Hevite, and the Jebusite, which he swore to thy fathers that he would give thee, a land that floweth with milk and honey, thou shalt celebrate this manner of sacred rites in this month.

6 Seven days shalt thou eat unleavened bread: and on the seventh day shall be the solemnity of the Lord.

7 Unleavened bread shall you eat seven days: there shall not be seen any thing leavened with thee, nor in all thy coasts.

8 And thou shalt tell thy son in that day, saying: This is what the Lord did to me when I came forth out of Egypt.

9 And it shall be as a sign in thy hand, and as a memorial before thy eyes; and that the law of the Lord be always in thy mouth, for with a strong hand the Lord hath brought thee out of the land of Egypt.