Exodus 13:13
And every firstling 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.
Nave's Topical Index—AKJV

Exodus 34:20
But the firstling 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.
Nave's Topical Index—AKJV

Leviticus 27:27
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.
Nave's Topical Index—AKJV

Numbers 3:40-51
And the LORD said to Moses, Number all the firstborn of the males of the children of Israel from a month old and upward, and take the number of their names.
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Numbers 18:15-17
Every thing that opens the matrix in all flesh, which they bring to the LORD, whether it be of men or beasts, shall be yours: nevertheless the firstborn of man shall you surely redeem, and the firstling of unclean beasts shall you redeem.
Nave's Topical Index—AKJV