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.
Matthew Henry's Commentary on 1 Chronicles 23:2-6
Commentary on 1 Chronicles 23:1-23
(Read 1 Chronicles 23:1-23)
David, having given charge concerning the building of the temple, settles the method of the temple service, and orders the officers of it. When those of the same family were employed together, it would engage them to love and assist one another.