Thematic Bible: Divided them into four classes

Of these, twenty and four thousand were to oversee the work of the house of Jehovah; and six thousand were officers and judges; and four thousand were doorkeepers; and four thousand praised Jehovah with the instruments which I made,'said David , to praise therewith. And David divided them into courses according to the sons of Levi: Gershon, Kohath, and Merari.