Exodus 12
24 Ref You shall observe this thing for an ordinance to you and to your sons forever.
25 Ref It shall happen when you have come to the land which Yahweh will give you, according as he has promised, that you shall keep this service.
26 Ref It will happen, when your children ask you, 'What do you mean by this service?'
27 Ref that you shall say, 'It is the sacrifice of Yahweh's Passover, who passed over the houses of the children of Israel in Egypt, when he struck the Egyptians, and spared our houses.'" The people bowed their heads and worshiped.