Numbers 3:43-45

Revised Standard Version Catholic Edition

⁴³ And all the first-born males, according to the number of names, from a month old and upward as numbered were twenty-two thousand two hundred and seventy-three.

⁴⁴ And the Lord said to Moses, ⁴⁵ “Take the Levites instead of all the first-born among the people of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be mine: I am the Lord.