Numbers 4:28-30

Wycliffe Bible

²⁸ This is the office of the families of Gershonites, in the tabernacle of [the] bond of peace (This is the service of the Gershonite families in the Tabernacle of the Covenant); and they shall be under the hand of Ithamar, the son of Aaron, [the] priest.

²⁹ Also thou shalt number the sons of Merari, by the families and houses of their fathers,

³⁰ from thirty years and above unto fifty years, all that enter to the office of their service, and to the adorning of the bond of peace of witnessing. (from thirty years of age up to fifty years old, all who enter to serve in the Tabernacle of the Covenant, that is, in the Tabernacle of the Witnessing.)