Numbers 4:23-26

23From thirty years old up to fifty years old, you shall list them, all who can come to do duty, to do service in the tent of meeting.

24This is the service of the clans of the Gershonites, in serving and bearing burdens:

25they shall carry the curtains of the tabernacle and the tent of meeting with its covering and the covering of goatskin that is on top of it and the screen for the entrance of the tent of meeting

26and the hangings of the court and the screen for the entrance of the gate of the court that is around the tabernacle and the altar, and their cords and all the equipment for their service. And they shall do all that needs to be done with regard to them.