Numbers 4:32-34

New Revised Standard Version Catholic Edition

³² and the pillars of the court all around with their bases, pegs, and cords, with all their equipment and all their related service; and you shall assign by name the objects that they are required to carry. ³³ This is the service of the clans of the Merarites, the whole of their service relating to the tent of meeting, under the hand of Ithamar son of Aaron the priest.

Census of the Levites

³⁴ So Moses and Aaron and the leaders of the congregation enrolled the Kohathites, by their clans and their ancestral houses,