Numbers 4:31-33 - The Duties Of The Merarite Clans
31 And this is the charge, that they must wait upon in all that they must serve in the tabernacle of witness: The boards of the dwelling, and the bars, pillars, and sockets thereof, 32 and the pillars of the court round about, and their sockets, pins and cords with all that pertaineth and serveth unto them. And by name ye shall reckon the things that they must wait upon to bear. 33 This is the service of the kindreds of the sons of Merari in all their service in the tabernacle of witness by the hand of Ithamar the son of Aaron the priest."