Numbers 4:28
This is the service of the families of the sons of Gershon in the tabernacle of the congregation: and their charge shall be under the hand of Ithamar the son of Aaron the priest.
Nave's Topical Index—AKJV

Numbers 7:8
And four wagons and eight oxen he gave to the sons of Merari, according to their service, under the hand of Ithamar the son of Aaron the priest.
Nave's Topical Index—AKJV