1 Chronicles 23:1-6
Rules for the Levites
1 David was old and his life had nearly finished. He chose his son Solomon to rule over Israel as king.
23:1David was about 70 years old.
2 He brought together all Israel's leaders, as well as the priests and the Levites. 3 His officers counted all the Levites who were 30 years old or older. There were 38,000 men. 4 David said, ‘24,000 of these Levite men must have authority for the work of the Lord's temple. 6,000 of them will be officers and judges. 5 4,000 of them will be guards at the gates of the temple. 4,000 of them will use music to praise the Lord. They will use the musical instruments that I have provided for them.’
6 David made the Levites into three separate groups. Each group had descendants from one of Levi's sons: Gershon, Kohath and Merari.