17 And these were the sons of Levi by their names: Gershon, and Kohath, and Merari.
18 And these are the names of the sons of Gershon by their families: Libni and Shimei.
19 And the sons of Kohath by their families: Amram, and Izhar, Hebron, and Uzziel.
20 And the sons of Merari by their families: Mahli and Mushi. These are the families of the Levites according to their fathers' houses.
21 Of Gershon was the family of the Libnites, and the family of the Shimeites: these are the families of the Gershonites.
22 Those that were numbered of them, according to the number of all the males, from a month old and upward, even those that were numbered of them were seven thousand and five hundred.
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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.