Exodus 13:12

9 and it hath been to thee for a sign on thy hand, and for a memorial between thine eyes, so that the law of Jehovah is in thy mouth, for by a strong hand hath Jehovah brought thee out from Egypt;

10 and thou hast kept this statute at its appointed season from days to days.

11 `And it hath been, when Jehovah bringeth thee in unto the land of the Canaanite, as He hath sworn to thee and to thy fathers, and hath given it to thee,

12 that thou hast caused every one opening a womb to pass over to Jehovah, and every firstling -- the increase of beasts which thou hast: the males [are] Jehovah`s.

13 `And every firstling of an ass thou dost ransom with a lamb, and if thou dost not ransom [it], then thou hast beheaded it: and every first-born of man among thy sons thou dost ransom.

14 `And it hath been, when thy son asketh thee hereafter, saying, What [is] this? that thou hast said unto him, By strength of hand hath Jehovah brought us out from Egypt, from a house of servants;

15 yea, it cometh to pass, when Pharaoh hath been pained to send us away, that Jehovah doth slay every first-born in the land of Egypt, from the first-born of man even unto the first-born of beast; therefore I am sacrificing to Jehovah all opening a womb who [are] males, and every first-born of my sons I ransom;