Exodus 13:6

3 And Moses said to the people, Let this day, on which you came out of Egypt, out of your prison-house, be kept for ever in memory; for by the strength of his hand the Lord has taken you out from this place; let no leavened bread be used.

4 On this day, in the month Abib, you are going out.

5 And it will be that, when the Lord takes you into the land of the Canaanite and the Hittite and the Amorite and the Hivite and the Jebusite, the land which he made an oath to your fathers that he would give you, a land flowing with milk and honey, you will do this act of worship in this month.

6 For seven days let your food be unleavened cakes; and on the seventh day there is to be a feast to the Lord.

7 Unleavened cakes are to be your food through all the seven days; let no leavened bread be seen among you, or any leaven, in any part of your land.

8 And you will say to your son in that day, It is because of what the Lord did for me when I came out of Egypt.

9 And this will be for a sign to you on your hand and for a mark on your brow, so that the law of the Lord may be in your mouth: for with a strong hand the Lord took you out of Egypt.