Thematic Bible: Divided them into four classes

Of whom 24,000 were to oversee the work of the house of the Lord and 6,000 were to be officers and judges. And, said David, 4,000 shall be gatekeepers and 4,000 are to praise the Lord with the instruments which I made for praise. And David organized them in sections according to the sons of Levi: Gershon, Kohath, and Merari.