Numbers 4:31-33

31This 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, 32and the posts of the surrounding courtyard with their bases, tent pegs, and ropes, including all their equipment and everything related to their use. You shall assign by name the items that they are responsible to carry.

33This is the service of the Merarite clans according to all their work at the Tent of Meeting, under the direction of Ithamar son of Aaron the priest.”