Numbers 4:28-33

28This is the service of the clans of the sons of the Gershonites in the tent of meeting, and their guard duty is to be under the direction of Ithamar the son of Aaron the priest. 29“As for the sons of Merari, you shall list them by their clans and their fathers’ houses. 30From thirty years old up to fifty years old, you shall list them, everyone who can come on duty, to do the service of the tent of meeting. 31And this is what they are charged to carry, as the whole of their service in the tent of meeting: the frames of the tabernacle, with its bars, pillars, and bases, 32and the pillars around the court with their bases, pegs, and cords, with all their equipment and all their accessories. And you shall list by name the objects that they are required to carry. 33This is the service of the clans of the sons of Merari, the whole of their service in the tent of meeting, under the direction of Ithamar the son of Aaron the priest.”