Numbers 4:16, 28, 33

And the charge of Eleazar the son of Aaron the priest shall be the oil for the light, and the sweet incense, and the continual meal-offering, and the anointing oil, the charge of all the tabernacle, and of all that therein is, the sanctuary, and the furniture thereof.

This is the service of the families of the sons of the Gershonites in the tent of meeting: and their charge shall be under the hand of Ithamar the son of Aaron the priest.

This is the service of the families of the sons of Merari, according to all their service, in the tent of meeting, under the hand of Ithamar the son of Aaron the priest.