20 And the sons of Merar'i by their families: Mahli and Mushi. These are the families of the Levites, by their fathers' houses. 21 Of Gershon were the family of the Libnites and the family of the Shim'e-ites; these were the families of the Gershonites. 22 Their number according to the number of all the males from a month old and upward was seven thousand five hundred. 23 The families of the Gershonites were to encamp behind the tabernacle on the west, 24 with Eli'asaph, the son of La'el as head of the fathers' house of the Gershonites. 25 And the charge of the sons of Gershon in the tent of meeting was to be the tabernacle, the tent with its covering, the screen for the door of the tent of meeting, 26 the hangings of the court, the screen for the door of the court which is around the tabernacle and the altar, and its cords; all the service pertaining to these. 27 Of Kohath were the family of the Amramites, and the family of the Izhar'ites, and the family of the He'bronites, and the family of the Uzzie'lites; these are the families of the Ko'hathites. 28 According to the number of all the males, from a month old and upward, there were eight thousand six hundred, attending to the duties of the sanctuary. 29 The families of the sons of Kohath were to encamp on the south side of the tabernacle, 30 with Eli-za'phan the son of Uz'ziel as head of the fathers' house of the families of the Ko'hathites. 31 And their charge was to be the ark, the table, the lampstand, the altars, the vessels of the sanctuary with which the priests minister, and the screen; all the service pertaining to these. 32 And Elea'zar the son of Aaron the priest was to be chief over the leaders of the Levites, and to have oversight of those who had charge of the sanctuary. 33 Of Merar'i were the family of the Mahlites and the family of the Mushites: these are the families of Merar'i. 34 Their number according to the number of all the males from a month old and upward was six thousand two hundred. 35 And the head of the fathers' house of the families of Merar'i was Zu'riel the son of Ab'ihail; they were to encamp on the north side of the tabernacle.
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.