Exodus 13:3-5

So Moses said to the people, “This is a day to remember forever—the day you left Egypt, the place of your slavery. Today the LORD has brought you out by the power of his mighty hand. (Remember, eat no food containing yeast.) On this day in early spring, in the month of Abib, you have been set free. You must celebrate this event in this month each year after the LORD brings you into the land of the Canaanites, Hittites, Amorites, Hivites, and Jebusites. (He swore to your ancestors that he would give you this land—a land flowing with milk and honey.)