1 Chronicles 23:3-6

EJ2000(i) 3 were numbered from the age of thirty years and upward; and their number by their polls, man by man, was thirty-eight thousand. 4 Of which, twenty-four thousand were to set forward the work of the house of the LORD, and six thousand were officers and judges; 5 moreover, four thousand were porters, and four thousand praised the LORD with the instruments which David had made to praise therewith. 6 And David divided them into courses according to the sons of Levi, namely, Gershon, Kohath, and Merari.