Numbers 4:29-33

29“As for the sons of Merari, you shall number them by their families and by their fathers’ house.

30From thirty years old and above, even to fifty years old, you shall number them, everyone who enters the service to do the work of the tabernacle of meeting.

31And this is what they must carry as all their service for the tabernacle of meeting: the boards of the tabernacle, its bars, its pillars, its sockets,

32and the pillars around the court with their sockets, pegs, and cords, with all their furnishings and all their service; and you shall assign to each man by name the items he must carry.

33This is the service of the families of the sons of Merari, as all their service for the tabernacle of meeting, under the authority of Ithamar the son of Aaron the priest.”