1 Chronicles 23:1-8

1 And David is old, and satisfied with days, and causeth his son Solomon to reign over Israel,
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.
7 Of the Gershonite: Laadan and Shimei.
8 Sons of Laadan: the head [is] Jehiel, and Zetham, and Joel, three.
Young's Literal Translation is in the public domain.