Numbers 4:28

25 They are to carry the curtains of the tabernacle, the Tent of Meeting with the covering of fine leather over it, the curtains for the entrance to the Tent of Meeting,

26 the curtains of the courtyard, and the curtains for the entrance at the gate of the courtyard that surrounds the tabernacle and altar, along with their ropes and all the equipment for their service. The Gershonites will do all that needs to be done with these items.

27 All the service of the Gershonites—all their transport duties and other work—is to be done at the direction of Aaron and his sons; you are to assign to them all that they are responsible to carry.

28 This is the service of the Gershonite clans at the Tent of Meeting, and their duties shall be under the direction of Ithamar son of Aaron the priest.

29 As for the sons of Merari, you are to number them by their clans and families,

30 from thirty to fifty years old, counting everyone who comes to serve in the work of the Tent of Meeting.

31 This is the duty for all their service at the Tent of Meeting: to carry the frames of the tabernacle with its crossbars, posts, and bases,