Exodus 13
12 Ref 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 Ref `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 Ref `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 Ref 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;