Exodus 12

24 ‘And ye have observed this thing, for a statute to thee, and to thy sons — unto the age;

25 and it hath been, when ye come in unto the land which Jehovah giveth to you, as He hath spoken, that ye have kept this service;

26 and it hath come to pass when your sons say unto you, What [is] this service ye have?

27 that ye have said, A sacrifice of passover it [is] to Jehovah, who passed over the houses of the sons of Israel in Egypt, in His smiting the Egyptians, and our houses He delivered.’