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. 23 The families of the Gershonites shall encamp behind the tabernacle westward. 24 And the prince of the fathers' house of the Gershonites shall be Eliasaph the son of Lael. 25 And the charge of the sons of Gershon in the tent of meeting shall be the tabernacle, and the Tent, the covering thereof, and the screen for the door of the tent of meeting, 26 and the hangings of the court, and the screen for the door of the court, which is by the tabernacle, and by the altar round about, and the cords of it for all the service thereof. 27 And of Kohath was the family of the Amramites, and the family of the Izharites, and the family of the Hebronites, and the family of the Uzzielites: these are the families of the Kohathites. 28 According to the number of all the males, from a month old and upward, there were eight thousand and six hundred, keeping the charge of the sanctuary. 29 The families of the sons of Kohath shall encamp on the side of the tabernacle southward. 30 And the prince of the fathers' house of the families of the Kohathites shall be Elizaphan the son of Uzziel. 31 And their charge shall be the ark, and the table, and the candlestick, and the altars, and the vessels of the sanctuary wherewith they minister, and the screen, and all the service thereof. 32 And Eleazar the son of Aaron the priest shall be prince of the princes of the Levites, [and have] the oversight of them that keep the charge of the sanctuary. 33 Of Merari was the family of the Mahlites, and the family of the Mushites: these are the families of Merari. 34 And those that were numbered of them, according to the number of all the males, from a month old and upward, were six thousand and two hundred. 35 And the prince of the fathers' house of the families of Merari was Zuriel the son of Abihail: they shall encamp on the side of the tabernacle northward.
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.