Numbers 4:25-27

25they shall carry 1the curtains of the tabernacle and the tent of meeting with its covering and 2the covering of fine leather that is on top of it, and the curtain for the entrance of the tent of meeting,

26and 3the curtains of the courtyard, the curtain for the entrance of the gate of the courtyard that is around the tabernacle and the altar, and their ropes and all the equipment for their service; and everything that is to be done 4by them, 5they shall perform.

27All the service of the sons of the Gershonites, that is, all their loads and all their work, shall be performed at the 6command of Aaron and his sons; and you shall assign to them as a duty all their loads.