Numbers 18:15

The firstborn of every living thing, man or animal, presented to the Lord belongs to you. But you must certainly redeem the firstborn of man, and redeem the firstborn of an unclean animal.

Exodus 34:20

You must redeem the firstborn of a donkey with a sheep, but if you do not redeem it, break its neck. You must redeem all the firstborn of your sons. No one is to appear before Me empty-handed.

Exodus 13:2

“Consecrate every firstborn male to Me, the firstborn from every womb among the Israelites, both man and domestic animal; it is Mine.”

Exodus 13:12-13

you are to present to the Lord every firstborn male of the womb. All firstborn offspring of the livestock you own that are males will be the Lord’s.

Exodus 22:29

“You must not hold back offerings from your harvest or your vats. Give Me the firstborn of your sons.

Leviticus 27:26-27

“But no one can consecrate a firstborn of the livestock, whether an animal from the herd or flock, to the Lord, because a firstborn already belongs to the Lord.

Numbers 3:13

because every firstborn belongs to Me. At the time I struck down every firstborn in the land of Egypt, I consecrated every firstborn in Israel to Myself, both man and animal. They are Mine; I am Yahweh.”

Numbers 3:46

As the redemption price for the 273 firstborn Israelites who outnumber the Levites,

Treasury of Scripture Knowledge

Summary

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.

General references

Bible References

The firstborn

Exodus 13:13
You must redeem every firstborn of a donkey with a flock animal, but if you do not redeem it, break its neck. However, you must redeem every firstborn among your sons.
Exodus 34:20
You must redeem the firstborn of a donkey with a sheep, but if you do not redeem it, break its neck. You must redeem all the firstborn of your sons. No one is to appear before Me empty-handed.
Leviticus 27:27
If it is one of the unclean livestock, it must be ransomed according to your assessment by adding a fifth of its value to it. If it is not redeemed, it can be sold according to your assessment.

General references

Numbers 3:15
“Register the Levites by their ancestral houses and their clans. You are to register every male one month old or more.”

Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.