Exodus 13:3; Exodus 13:9

3 Then Moses said to the people, “Commemorate this day, the day you came out of Egypt, out of the land of slavery, because the LORD brought you out of it with a mighty hand. Eat nothing containing yeast.

9 This observance will be for you like a sign on your hand and a reminder on your forehead that this law of the LORD is to be on your lips. For the LORD brought you out of Egypt with his mighty hand.