Numbers 18:15

15 Every thing that openeth the womb 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.

Numbers 18:15 In-Context

13 And whatsoever is first ripe in the land, which they shall bring unto the LORD, shall be thine. Every one who is clean in thine house shall eat of it.
14 Every thing devoted in Israel shall be thine.
15 Every thing that openeth the womb 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, according to the shekel of the sanctuary which is twenty gerahs.
17 But the firstling of a cow, or the firstling of a sheep, or the firstling of a goat thou shalt not redeem. They are holy. Thou shalt sprinkle their blood upon the altar, and shalt burn their fat for an offering made by fire for a sweet savor unto the LORD.
Third Millennium Bible (TMB), New Authorized Version, Copyright 1998 by Deuel Enterprises, Inc., Gary, SD 57237. All rights reserved.