Numbers 3:39-41

New Living Translation

³⁹ When Moses and Aaron counted the Levite clans at the Lord’s command, the total number was 22,000 males one month old or older.

Redeeming the Firstborn Sons

⁴⁰ Then the Lord said to Moses, “Now count all the firstborn sons in Israel who are one month old or older, and make a list of their names. ⁴¹ The Levites must be reserved for me as substitutes for the firstborn sons of Israel; I am the Lord. And the Levites’ livestock must be reserved for me as substitutes for the firstborn livestock of the whole nation of Israel.”