1 Chronicles 23:2-6

MSB(i) 2 Then he gathered all the leaders of Israel, as well as the priests and Levites. 3 The Levites thirty years of age or older were counted, and the total number of men was 38,000. 4 “Of these,” said David, “24,000 are to oversee the work of the house of the LORD, 6,000 are to be officers and judges, 5 4,000 are to be gatekeepers, and 4,000 are to praise the LORD with the instruments I have made for giving praise.” 6 Then David divided the Levites into divisions according to the sons of Levi: Gershom, Kohath, and Merari.