Numbers 4:23-26

23from 1thirty years and upward to fifty years old, you shall 2number them; all who enter to perform the service to do the work in the tent of meeting.

24This is the service of the families of the Gershonites, in serving and in carrying:

25they shall carry 3the curtains of the tabernacle and the tent of meeting with its covering and 4the covering of porpoise skin that is on top of it, and the screen for the doorway of the tent of meeting,

26and 5the hangings of the court, and the screen for the doorway of the gate of the court which is around the tabernacle and the altar, and their cords and all the equipment for their service; and all that is to be done, 6they shall perform.