Exodus 12:26-27

Revised Standard Version

²⁶ And when your children say to you, ‘What do you mean by this service?’ ²⁷ you shall say, ‘It is the sacrifice of the Lord’s passover, for he passed over the houses of the people of Israel in Egypt, when he slew the Egyptians but spared our houses.’” And the people bowed their heads and worshiped.