Exodus 13:3-10

Moses said to the people, “Remember [solemnly observe and commemorate] this day on which you came out of Egypt, out of the house of bondage and slavery; for by a strong and powerful hand the LORD brought you out of this place. And nothing leavened shall be eaten. On this day in the month Abib, you are about to go onward. And it shall be when the LORD brings you into the land of the Canaanite, the Hittite, the Amorite, the Hivite, and the Jebusite, which He swore to your fathers to give you, a land [of abundance] flowing with milk and honey, that you shall keep and observe this rite (service) in this month. For seven days you shall eat unleavened bread, and on the seventh day there shall be a feast to the LORD. Unleavened bread shall be eaten throughout the seven days; no leavened bread shall be seen with you, nor shall there be leaven within the borders of your territory. You shall explain this to your son on that day, saying, ‘It is because of what the LORD did for me when I came out of Egypt.’ It shall serve as a sign to you on your hand (arm), and as a reminder on your forehead, so that the instruction (law) of the LORD may be in your mouth; for with a strong and powerful hand the LORD brought you out of Egypt. Therefore, you shall keep this ordinance at this time from year to year.