Numbers 18:15
▸ Hear this chapter, lit word by wordEvery 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.
— Numbers 18:15, King James Version
In other translations
Everything that opens the womb, of all flesh which they offer to Yahweh, both of man and animal shall be your: nevertheless the firstborn of man shall you surely redeem, and the firstborn of unclean animals shall you redeem.
Everything that openeth the womb, of all flesh which they offer unto Jehovah, both of man and beast shall be thine: nevertheless the first-born of man shalt thou surely redeem, and the firstling of unclean beasts shalt thou redeem.
every one opening a womb of all flesh which they bring near to Jehovah, among man and among beast, is thine; only, thou dost certainly ransom the first-born of man, and the firstling of the unclean beast thou dost ransom.