Numbers 3:44-46

King James Version

⁴⁴ And the Lord spake unto Moses, saying,

⁴⁵ Take the Levites instead of all the firstborn among the children of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be mine: I am the Lord.

⁴⁶ 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;