27. At the appointment of Aaron and his sons will be all the service of the sons of the Gershonites, in all their burdens, and in all their service. And you shall assign to them all their tasks as their duty.
28. This is the service of the families of the sons of Gershon in the tent of meeting. And their charge will be under the hand of Ithamar the son of Aaron the priest.
29. As for the sons of Merari, you will number them by their families, by the house of their fathers.
30. From thirty years old and older, even to fifty years old, you will number them, everyone who enters into the service, to do the work of the tent of meeting.