Numbers 3:41-43

New Living Translation

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.”

⁴² So Moses counted the firstborn sons of the people of Israel, just as the Lord had commanded. ⁴³ The number of firstborn sons who were one month old or older was 22,273.