1 Chronicles 23:2-6

CLV(i) 2 and gathers all the heads of Israel, and the priests, and the Levites;" 3 and the Levites are numbered from a son of thirty years and upward, and their number, by their polls, is of mighty men thirty and eight thousand. 4 Of these to preside over the work of the house of Yahweh [are] twenty and four thousand, and officers and judges six thousand, 5 and four thousand gatekeepers, and four thousand giving praise to Yahweh, `with instruments that I made for praising,' [said David.. 6 And David distributes them into courses:Of the sons of Levi:of Gershon, Kohath, and Merari.