1 Chronicles 23:3-6

23:3 The Levites who were thirty years old and up were counted; there were 38,000 men. 23:4 David said, “Of these, 24,000 are to direct the work of the Lord’s temple; 6,000 are to be officials and judges; 23:5 4,000 are to be gatekeepers; and 4,000 are to praise the Lord with the instruments I supplied for worship.” 23:6 David divided them into groups corresponding to the sons of Levi: Gershon, Kohath, and Merari.

1 Chronicles 23:32

23:32 They were in charge of the meeting tent and the holy place, and helped their relatives, the descendants of Aaron, in the service of the Lord’s temple.