Their assigned responsibility was to care for the Ark, the table, the lampstand, the altars, the articles of the sanctuary used with them, the veil, and everything connected with these items.
Eleazar, son of Aaron the priest, is to supervise obtaining olive oil for the lamps, the aromatic incense, the daily grain offering, and the anointing oil. He is in charge of the whole Tabernacle and everything in it—all the holy things and equipment.”
All that they do is to be under the supervision of Aaron and his sons—all their work and carrying assignments. You are to tell them all they are required to carry.
They can still help their fellow Levites in their assignments, but they are not to do the actual work themselves. These are the arrangements in the case of the Levites.”