Numbers 4:25-27

25They are to carry the curtains of the tabernacle, that is, the tent of meeting, its covering and its outer covering of durable leather, the curtains for the entrance to the tent of meeting,

26the curtains of the courtyard surrounding the tabernacle and altar, the curtain for the entrance to the courtyard, the ropes and all the equipment used in the service of the tent. The Gershonites are to do all that needs to be done with these things.

27All their service, whether carrying or doing other work, is to be done under the direction of Aaron and his sons. You shall assign to them as their responsibility all they are to carry.