Numbers 3:46

And for the redemption of the two hundred and seventy-three of the first-born of the sons of Israel, who are over and above [the number of] the Levites,

Exodus 13:13

And every firstling of a donkey thou shall redeem with a lamb, and if thou will not redeem it, then thou shall break its neck. And all the first-born of man among thy sons thou shall redeem.

Numbers 18:15-16

Everything that opens the womb, of all flesh which they offer to LORD, both of man and beast shall be thine. Nevertheless the first-born of man thou shall surely redeem, and the firstling of unclean beasts thou shall redeem.

Treasury of Scripture Knowledge

Summary

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;

Which are

General references

Bible References

Redeemed

Numbers 18:15
Everything that opens the womb, of all flesh which they offer to LORD, both of man and beast shall be thine. Nevertheless the first-born of man thou shall surely redeem, and the firstling of unclean beasts thou shall redeem.
Exodus 13:13
And every firstling of a donkey thou shall redeem with a lamb, and if thou will not redeem it, then thou shall break its neck. And all the first-born of man among thy sons thou shall redeem.

Which are

Numbers 3:39
All who were numbered of the Levites, whom Moses and Aaron numbered at the commandment of LORD, by their families, all the males from a month old and upward, were twenty-two thousand.

General references

Numbers 3:50
He took the money from the first-born of the sons of Israel, a thousand three hundred and sixty-five [shekels], according to the shekel of the sanctuary.