Exodus 12:42-44

Young's Literal Translation

⁴² A night of watchings it [is] to Jehovah, to bring them out from the land of Egypt; it [is] this night to Jehovah of watchings to all the sons of Israel to their generations.

⁴³ And Jehovah saith unto Moses and Aaron, `This [is] a statute of the passover; Any son of a stranger doth not eat of it;

⁴⁴ and any man's servant, the purchase of money, when thou hast circumcised him -- then he doth eat of it;