Numbers 3:39-41

New King James Version

^39 (A)All who were numbered of the Levites, whom Moses and Aaron numbered at the commandment of the Lord, by their families, all the males from a month old and above, were twenty-two thousand.

Levites Dedicated Instead of the Firstborn

⁴⁰ Then the Lord said to Moses: ^(B)“Number^[a] all the firstborn males of the children of Israel from a month old and above, and take the number of their names. ^41 (C)And you shall take the Levites for Me—I am the Lord—instead of all the firstborn among the children of Israel, and the livestock of the Levites instead of all the firstborn among the livestock of the children of Israel.”