Numbers 3:43-45

New Revised Standard Version Catholic Edition

⁴³ The total enrollment, all the firstborn males from a month old and upward, counting the number of names, was twenty-two thousand two hundred seventy-three.

⁴⁴ Then the Lord spoke to Moses, saying: ⁴⁵ Accept the Levites as substitutes for all the firstborn among the Israelites, and the livestock of the Levites as substitutes for their livestock; and the Levites shall be mine. I am the Lord.