6 And David put them into divisions under the names of the sons of Levi: Gershon, Kohath, and Merari. 7 Of the Gershonites: Ladan and Shimei. 8 The sons of Ladan: Jehiel the chief, and Zetham and Joel, three. 9 The sons of Shimei: Shelomoth and Haziel and Haran, three; these were the heads of the families of Ladan. 10 And the sons of Shimei: Jahath, Zizah and Jeush and Beriah; these four were the sons of Shimei. 11 Jahath was the chief and Zizah the second; but Jeush and Beriah had only a small number of sons, so they were grouped together as one family. 12 The sons of Kohath: Amram, Izhar, Hebron, and Uzziel, four. 13 The sons of Amram: Aaron and Moses; and Aaron was made separate and holy, he and his sons for ever, for the care of the most holy things and the burning of offerings before the Lord, to do his work and give blessings in his name for ever.
Matthew Henry's Commentary on 1 Chronicles 23:6-13
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.