6. David then divided the Levites into groupings named after the sons of Levi: Gershon, Kohath, and Merari.
24. These are the sons of Levi twenty years and older, divided up according to families and heads of families and listed in the work groups that took care of the worship in the sanctuary of God.
32. In short, the Levites, with the sons of Aaron as their companions in the ministry of holy worship, were responsible for everything that had to do with worship: the place and times and ordering of worship.