Numbers 3:46

For the ransom of the 273 of the firstborn of the sons of Israel who are in excess beyond the Levites,

Exodus 13:13

But every first offspring of a donkey you shall redeem with a lamb, but if you do not redeem it, then you shall break its neck; and every firstborn of man among your sons you shall redeem.

Numbers 18:15-16

Every first issue of the womb of all flesh, whether man or animal, which they offer to the Lord, shall be yours; nevertheless the firstborn of man you shall surely redeem, and the firstborn of unclean animals you 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
Every first issue of the womb of all flesh, whether man or animal, which they offer to the Lord, shall be yours; nevertheless the firstborn of man you shall surely redeem, and the firstborn of unclean animals you shall redeem.
Exodus 13:13
But every first offspring of a donkey you shall redeem with a lamb, but if you do not redeem it, then you shall break its neck; and every firstborn of man among your sons you shall redeem.

Which are

Numbers 3:39
All the numbered men of the Levites, whom Moses and Aaron numbered at the command of the Lord by their families, every male from a month old and upward, were 22,000.

General references

Numbers 3:50
from the firstborn of the sons of Israel he took the money in terms of the shekel of the sanctuary, 1,365.