Exodus 13:5-9

5When Adonai brings you into the land of the Canaanites, the Hittites, the Amorites, the Hivites and the Jebusites, which He swore to your fathers to give you, a land flowing with milk and honey, you are to observe this service during this month.

6For seven days you are to eat matzah , and the seventh day is to be a feast to Adonai.

7Matzot is to be eaten throughout the seven days, and no hametz is to be seen among you, nor within any of your borders.

8“You are to tell your son on that day saying, ‘It is because of what Adonai did for me when I came out of Egypt.

9So it will be like a sign on your hand and a reminder between your eyes, so that the Torah of Adonai may be in your mouth. For with a strong hand Adonai has brought you out of Egypt.