Exodus 12:24-27

You shall observe this event [concerning Passover] as an ordinance for you and for your children forever. When you enter the land which the LORD will give you, as He has promised, you shall keep and observe this service. When your children say to you, ‘What does this service mean to you?’ you shall say, ‘It is the sacrifice of the LORD’S Passover, for He passed over the houses of the Israelites in Egypt when He struck the Egyptians, but spared our houses.’ ” And the people bowed [their heads] low and worshiped [God].