15 Every thing that opens the womb in all flesh, which they bring unto the LORD, whether it be of men or beasts, shall be yours: nevertheless the firstborn of man shall you surely redeem, and the first born of unclean beasts shall you redeem.
Numbers 18:15 Cross References - UKJV
2 Sanctify unto me all the firstborn, whatsoever opens the womb among the children of Israel, both of man and of beast: it is mine.
12 That you shall set apart unto the LORD all that opens the womb, and every first born that comes of a beast which you have; the males shall be the LORD's. 13 And every first born of an ass you shall redeem with a lamb; and if you will not redeem it, then you shall break his neck: and all the firstborn of man among your children shall you redeem.
29 You shall not delay to offer the first of your ripe fruits, and of your liquors: the firstborn of your sons shall you give unto me.
20 But the first born of an ass you shall redeem with a lamb: and if you redeem him not, then shall you break his neck. All the firstborn of your sons you shall redeem. And none shall appear before me empty.
26 Only the first born of the beasts, which should be the LORD's first born, no man shall sanctify it; whether it be ox, or sheep: it is the LORD's. 27 And if it be of an unclean beast, then he shall redeem it according to your estimation, and shall add a fifth part of it thereto: or if it be not redeemed, then it shall be sold according to your estimation.
13 Because all the firstborn are mine; for on the day that I stroke all the firstborn in the land of Egypt I hallowed unto me all the firstborn in Israel, both man and beast: mine shall they be: I am the LORD.
46 And for those that are to be redeemed of the two hundred and threescore and thirteen of the firstborn of the children of Israel, which are more than the Levites;