This is the duty for all their service at the Tent of Meeting: to carry the frames of the tabernacle with its crossbars, posts, and bases,
We have here the charge of the other two families of the Levites, which, though not so honourable as the first, yet was necessary, and was to be done regularly. 1. The Gershonites were charged with all the drapery of the tabernacle, the curtains, and hangings, and the coverings of badgers' skins, Num 4:22-26.
Commenting on Numbers 4:21-33
And Moses and Aaron, and the chief of the congregation, numbered the sons of the Kohathites,.... Perhaps these chiefs were the same with those who were concerned with Moses and Aaron in numbering all the tribes whose names were given, Num 1:5; the Kohathites are begun with, according to the divine direction, and then the Gershonites and Merarites in their order; and in Num 4:34...
Num 4:31-32 Num 4:31 and Num 4:32, like Num 3:36 and Num 3:37. “The charge of their burden” (their carrying), i.e., the things which it was their duty to carry.
Commenting on Numbers 4:31-33