Exodus 12:24-26

Young's Literal Translation

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?