Numbers 18:15

Every thing that openeth the matrix in all flesh, which they bring to the LORD, whether of men or beast, shall be thine: nevertheless, the first born of man shalt thou surely redeem, and the firstling of unclean beasts shalt thou redeem.

Exodus 34:20

But the firstling of an ass thou shalt redeem with a lamb: and if thou shalt not redeem him, then shalt thou break his neck. All the first-born of thy sons thou shalt redeem. And none shall appear before me empty.

Exodus 13:2

Sanctify to me all the first-born, whatever openeth the womb among the children of Israel, both of man and of beast: it is mine.

Exodus 13:12-13

That thou shall set apart to the LORD all that openeth the matrix; and every firstling that cometh of a beast which thou hast, the males shall be the LORD'S.

Exodus 22:29

Thou shalt not delay to offer the first of thy ripe fruits, and of thy liquors: the first-born of thy sons shalt thou give to me.

Leviticus 27:26-27

Only the firstling of the beasts, which should be the LORD'S firstling, no man shall sanctify it; whether ox, or sheep: it is the LORD'S.

Numbers 3:13

Because all the first-born are mine; for on the day that I smote all the first-born in the land of Egypt, I hallowed to me all the first-born in Israel, both man and beast: mine they shall be: I am the LORD.

Numbers 3:46

And for those that are to be redeemed of the two hundred and seventy and three, of the first-born of the children of Israel, which are more than 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
And every firstling of an ass thou shalt redeem with a lamb; and if thou wilt not redeem it, then thou shalt break his neck: and all the first-born of man among thy children shalt thou redeem.
Exodus 34:20
But the firstling of an ass thou shalt redeem with a lamb: and if thou shalt not redeem him, then shalt thou break his neck. All the first-born of thy sons thou shalt redeem. And none shall appear before me empty.
Leviticus 27:27
And if it shall be of an unclean beast, then he shall redeem it, according to thy estimation, and shall add to it a fifth part of it: or if it shall be not redeemed, then it shall be sold according to thy estimation.

General references

Numbers 3:15
Number the children of Levi after the house of their fathers, by their families: every male from a month old and upward shalt thou number them.