This is the service of the families of the sons of Gershon in the Tent of Meeting (tabernacle); and their duties shall be under the direction of Ithamar the son of Aaron, the [high] priest.
from thirty years and upward to fifty years old, you shall number them, everyone who enters the service to do the work of the Tent of Meeting (tabernacle).
and he gave four carts and eight oxen to the sons of Merari, according to their service [in transporting the tabernacle], under the supervision of Ithamar the son of Aaron, the [high] priest.