Numbers 18:14-16 Darby Translation (DARBY)
14 Every devoted thing in Israel shall be thine.
15 Everything that breaketh open the womb of all flesh, which they present to Jehovah, of men or of beasts, shall be thine; nevertheless the firstborn of man shalt thou in any case ransom, and the firstborn of unclean beasts shalt thou ransom.
16 And those that are to be ransomed from a month old shalt thou ransom, according to thy valuation, for the money of five shekels, after the shekel of the sanctuary, which is twenty gerahs.
Numbers 18:14-16 New International Version (NIV)
14 “Everything in Israel that is devoted[a] to the Lord is yours. 15 The first offspring of every womb, both human and animal, that is offered to the Lord is yours. But you must redeem every firstborn son and every firstborn male of unclean animals. 16 When they are a month old, you must redeem them at the redemption price set at five shekels[b] of silver, according to the sanctuary shekel, which weighs twenty gerahs.