Numbers 3:38-40

New King James Version

^38 (A)Moreover those who were to camp before the tabernacle on the east, before the tabernacle of meeting, were Moses, Aaron, and his sons, ^(B)keeping charge of the sanctuary, ^(C)to meet the needs of the children of Israel; but ^(D)the outsider who came near was to be put to death. ^39 (E)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: ^(F)“Number^[a] all the firstborn males of the children of Israel from a month old and above, and take the number of their names.