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of the Book of Numbers, KJV

²⁷ At the appointment of Aaron and his sons shall be all the service of the sons of the Gershonites, in all their burdens, and in all their service: and ye shall appoint unto them in charge all their burdens.
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.
²⁹ As for the sons of Merari, thou shalt number them after their families, by the house of their fathers;