Numbers 4:31

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;

32 And the pillars of the open space outside it, with their bases and their nails and cords and all the instruments used, and everything which has to be done there; all the instruments for which they are responsible are to be numbered by name.

33 This is the work which the sons of Merari are to do in connection with the Tent of meeting, under the direction of Ithamar, the son of Aaron the priest.

34 So Moses and Aaron and the chiefs of the people took in hand the numbering of the sons of the Kohathites, by families, in the order of their fathers' houses;