20 The sons of Merari by clan: Mahli and Mushi. These are the clans of Levi, family by family. 21 Gershon was ancestor to the clans of the Libnites and Shimeites, known as the Gershonite clans. 22 All the males who were one month and older numbered 7,500. 23 The Gershonite clans camped on the west, behind The Dwelling, 24 led by Eliasaph son of Lael. 25 At the Tent of Meeting the Gershonites were in charge of maintaining The Dwelling and its tent, its coverings, the screen at the entrance to the Tent of Meeting, 26 the hangings of the Courtyard, the screen at the entrance to the Courtyard that surrounded The Dwelling and Altar, and the cords - in short, everything having to do with these things. 27 Kohath was ancestor to the clans of the Amramites, Izharites, Hebronites, and Uzzielites. These were known as the Kohathite clans. 28 All the males who were one month and older numbered 8,600. The Kohathites were in charge of the Sanctuary. 29 The Kohathite clans camped on the south side of The Dwelling, 30 led by Elizaphan son of Uzziel. 31 They were in charge of caring for the Chest, the Table, the Lampstand, the Altars, the articles of the Sanctuary used in worship, and the screen - everything having to do with these things. 32 Eleazar, the son of Aaron the priest, supervised the leaders of the Levites and those in charge of the Sanctuary. 33 Merari was ancestor to the clans of the Mahlites and the Mushites, known as the Merarite clans. 34 The males who were one month and older numbered 6,200. 35 They were led by Zuriel son of Abihail and camped on the north side of The Dwelling.
Matthew Henry's Commentary on Numbers 3:20-35
Commentary on Numbers 3:14-39
(Read Numbers 3:14-39)
The Levites were in three classes, according to the sons of Levi; Gershon, Kohath, and Merari; and these were subdivided into families. The posterity of Moses were not at all honoured or privileged, but stood upon the level with other Levites; thus it was plain, that Moses did not seek the advancement of his own family, or to secure any honours to it. The tribe of Levi was by much the least of all the tribes. God's chosen are but a little flock in comparison with the world.