Numbers 4:16, 27

“Eleazar son of Aaron the priest will be responsible for the oil of the lampstand, the fragrant incense, the daily grain offering, and the anointing oil. In fact, Eleazar will be responsible for the entire Tabernacle and everything in it, including the sanctuary and its furnishings.”

Aaron and his sons will direct the Gershonites regarding all their duties, whether it involves moving the equipment or doing other work. They must assign the Gershonites responsibility for the loads they are to carry.