39 All who were numbered of the Levites, whom Moses and Aaron numbered at the commandment of Yahweh, by their families, all the males from a month old and upward, were twenty-two thousand.
40 Yahweh said to Moses, "Number all the firstborn males of the children of Israel from a month old and upward, and take the number of their names.
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Commentary on Numbers 3 Matthew Henry Commentary
Chapter 3
This chapter and the next are concerning the tribe of Levi, which was to be mustered and marshalled by itself, and not in common with the other tribes, intimating the particular honour put upon them and the particular duty and service required from them. The Levites are in this chapter considered,
Num 3:1-13
Here,
Num 3:14-39
The Levites being granted to Aaron to minister to him, they are here delivered to him by tale, that he might know what he had, and employ them accordingly. Observe,
Num 3:40-51
Here is the exchange made of the Levites for the first-born.