Numbers 18:15-16 King James Version (KJV)
15 Every thing that openeth the matrix in all flesh, which they bring unto the LORD, whether it be of men or beasts, shall be thine: nevertheless the firstborn of man shalt thou surely redeem, and the firstling of unclean beasts shalt thou redeem.
16 And those that are to be redeemed from a month old shalt thou redeem, according to thine estimation, for the money of five shekels, after the shekel of the sanctuary, which is twenty gerahs.


Numbers 18:15-16 Amplified Bible (AMP)
15 Every firstborn of the womb of all flesh, whether it is man or animal, which they bring to the LORD, shall be yours; nevertheless, the firstborn of man you shall most certainly redeem, and the firstborn of unclean animals you shall redeem. 16 And their redemption price, from a month old you shall redeem, according to your valuation, for the [fixed] price of five shekels in silver, in accordance with the shekel of the sanctuary, which is twenty gerahs.
Amplified Bible (AMP) Copyright © 2015 by The Lockman Foundation, La Habra, CA 90631. All rights reserved.





These are my thoughts, please share yours.

15 The first born was given as a sacrifice so they were given back to the Lord which done by the people giving them to the priests, with children a sacrifice was made for the first born and then the baby was dedicated, we see a example of this in Luke where Mary and Joseph do this with Jesus at the temple.

16 This was done for the children and then a sacrifice was made, child sacrifices was not something the Lord wanted but what He does want is for Him to ahead of the child which by doing this shows He is.