Eleazar son of Aaron the priest was to be chief over the leaders of the Levites and to have oversight of those who performed the duties of the sanctuary.
Their responsibility was the ark, the table, the lampstand, the altars, the vessels of the sanctuary with which the priests minister, and the screen—all the service pertaining to these.
“Eleazar son of Aaron the priest shall have charge of the oil for the light, the fragrant incense, the regular grain offering, and the anointing oil, the oversight of all the tabernacle and all that is in it, in the sanctuary and in its utensils.”
All the service of the Gershonites shall be at the command of Aaron and his sons, in all that they are to carry and in all that they have to do, and you shall assign to them as duties all that they are to carry.
They may assist their brothers in the tent of meeting in carrying out their duties, but they shall perform no service. Thus you shall do with the Levites in assigning their duties.”