Duties of the Merarites
“As for the sons of Merari, you shall number them by their families (clans), by their fathers’ households; from thirty years and upward to fifty years old, you shall number them, everyone who enters the service to do the work of the Tent of Meeting (tabernacle). This is what they are assigned to carry [on the march], according to all their service in the Tent of Meeting: the boards [for the framework] of the tabernacle and its bars and its pillars and its sockets or bases, and the pillars around the courtyard with their sockets or bases and their pegs and their cords (tent ropes), with all their equipment and with all their [accessories for] service; and you shall assign each man by name the items he is to carry [on the march]. This is the work of the families of the sons of Merari, according to all their tasks in the Tent of Meeting (tabernacle), under the direction of Ithamar the son of Aaron, the priest.”
Numbers 4:29-33 (AMP)
The final clans, the Merarites, were responsible for what remained – the supporting frames of the tabernacle, its crossbars, posts and bases as well as anything related to the courtyard. These items provided the physical framework for the tabernacle.
The movement from assigning the most important objects to the least important was now complete. Even specific instructions were given regarding the handling of these lesser items to emphasize that even those objects were to be transported according to the Lord’s word.
While the Kohathites were assigned the holiest objects, every Levitical clan was needed and aided in setting up, tearing down, and transporting the tent of meeting.
Holman Old Testament Commentary – Numbers
The Moody Bible Commentary