Exodus 12

24 Keep thou this word; it shall be a lawful thing to thee and to thy sons till into without end.

25 And when ye shall enter into the land which the Lord shall give to you, as he promised, ye shall keep these ceremonies;

26 and when your sons shall say to you, What is this religion?

27 ye shall say to them, It is the sacrifice of the passing of the Lord, when he passed over the houses of the sons of Israel in Egypt, and smote the Egyptians, and delivered our houses. And the people was bowed, and worshipped.