6 And David organized them in divisions corresponding to the sons of Levi: Gershon, Kohath, and Merari. 7 The sons of Gershon[1] were Ladan and Shimei. 8 The sons of Ladan: Jehiel the chief, and Zetham, and Joel, three. 9 The sons of Shimei: Shelomoth, Haziel, and Haran, three. These were the heads of the fathers' houses of Ladan. 10 And the sons of Shimei: Jahath, Zina, and Jeush and Beriah. These four were the sons of Shimei. 11 Jahath was the chief, and Zizah the second; but Jeush and Beriah did not have many sons, therefore they became counted as a single father's house. 12 The sons of Kohath: Amram, Izhar, Hebron, and Uzziel, four. 13 The sons of Amram: Aaron and Moses. Aaron was set apart to dedicate the most holy things, that he and his sons forever should make offerings before the Lord and minister to him and pronounce blessings in his name forever.
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.