Numbers 4:23-26

23From thirty years old and upward to fifty years old shalt thou number them; every one that cometh to labour in the work, to perform the service in the tent of meeting.

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

25they shall carry the curtains of the tabernacle, and the tent of meeting, its covering, and the covering of badgers' skin that is above upon it, and the curtain of the entrance to the tent of meeting,

26and the hangings of the court, and the curtain of the entrance, of the gate of the court, which surroundeth the tabernacle and the altar, and the cords thereof, and all the instruments of their service; and all that is to be done for these things shall they perform.