22 Those who were numbered of them, according to the number of all the males, from a month old and upward, even those who were numbered of them were seven thousand five hundred.
Those who were numbered of the sons of Gershon, their families, and by their fathers' houses, from thirty years old and upward even to fifty years old, everyone who entered into the service, for work in the Tent of Meeting, even those who were numbered of them, by their families, by their fathers' houses, were two thousand six hundred thirty.
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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.