Exodus 13:3-5

3Then Moses said to the people, “Remember this day—the day when you left Egypt, the land of slavery. The Lord used his mighty hand to bring you out of there. Don’t eat anything made with yeast.

4Today, in the month of Abib, you are leaving Egypt.

5The Lord swore to your ancestors that he would give you the land of the Canaanites, Hittites, Amorites, Hivites, and Jebusites. When he brings you into that land flowing with milk and honey, you must observe this ceremony in this month.