Thematic Bible: Divided them into four classes

Of these - to preside over the work of the house of Yahweh, were twenty-four thousand, - and officers and judges, six thousand; and four thousand, were doorkeepers, - and, four thousand, were offerers of praise unto Yahweh, with instruments, which said David I made for offering praise. And David divided them into courses, - pertaining to the sons of Levi, to Gershon, Kohath and Merari.