Israel is to observe the annual celebration, keeping vigil for generations to come because the Lord has kept watch that night. The reenactment of each aspect of the Passover will remind Israel of their previous distress, God’s mighty deliverance, and the terrible price of freedom. To ensure corporate memory and continuity of the tradition, the redemption of the firstborn and eating unleavened bread are designed to prompt children’s questions. The phrase “like a sign on your hand and a reminder on your forehead” (13:9, 16) is also part of the command to teach children the torah …