Numbers 3:46

For the redemption of the two hundred seventy-three of the firstborn of the children of Israel, who exceed the number of the Levites,

Exodus 13:13

Every firstborn of a donkey you shall redeem with a lamb; and if you will not redeem it, then you shall break its neck; and you shall redeem all the firstborn of man among your sons.

Numbers 18:15-16

Everything that opens the womb, of all flesh which they offer to Yahweh, both of man and animal shall be yours: nevertheless you shall surely redeem the firstborn of man, and you shall redeem the firstborn of unclean animals.

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 Yahweh, both of man and animal shall be yours: nevertheless you shall surely redeem the firstborn of man, and you shall redeem the firstborn of unclean animals.
Exodus 13:13
Every firstborn of a donkey you shall redeem with a lamb; and if you will not redeem it, then you shall break its neck; and you shall redeem all the firstborn of man among your sons.

Which are

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

General references

Numbers 3:50
from the firstborn of the children of Israel he took the money, one thousand three hundred sixty-five shekels, after the shekel of the sanctuary: