1 Chronicles 23:3-6

ERV(i) 3 And the Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty and eight thousand. 4 Of these, twenty and four thousand were to oversee the work of the house of the LORD; and six thousand were officers and judges: 5 and four thousand were doorkeepers; and four thousand praised the LORD with the instruments which I made, [said David], to praise therewith. 6 And David divided them into courses according to the sons of Levi; Gershon, Kohath, and Merari.