1 Chronicles 23:2-6

YLT(i) 2 and gathereth 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 Jehovah are twenty and four thousand, and officers and judges six thousand, 5 and four thousand gatekeepers, and four thousand giving praise to Jehovah, `with instruments that I made for praising,' saith David. 6 And David distributeth them into courses: Of the sons of Levi: of Gershon, Kohath, and Merari.