Numbers 4:29 BBE

²⁷  From the mouth of Aaron and his sons the Gershonites will have word about all the things they are to do and take up; you are to give them their orders.

²⁸  This is the work of the family of the Gershonites in the Tent of meeting, and they will be under the direction of Ithamar, the son of Aaron the priest.

²⁹  The sons of Merari are to be numbered by families, in the order of their fathers' houses;

³⁰  Every one from thirty to fifty years old who is able to do the work of the Tent of meeting.

³¹  And this is their part in the work of the Tent of meeting: the transport of the boards and the rods of the Tent, with the pillars and their bases;