Numbers 3:36-37

36 aAnd the appointed guard duty of the sons of Merari involved the bframes of the tabernacle, cthe bars, dthe pillars, the bases, and all their accessories; all the service connected with these; 37also ethe pillars around the court, with their bases and fpegs and gcords.

Numbers 7:8-9

8And four wagons and eight oxen hhe gave to the sons of Merari, according to their service, under the direction of Ithamar the son of Aaron the priest. 9But to the sons of Kohath he gave none, because they were charged with ithe service of the holy things that jhad to be carried on the shoulder.
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