Jamieson, Fausset and Brown on 1 Chronicles 12:23

23. these are the numbers of the bands ... that came to David to Hebron--after the death of Ish-bosheth (see on 2Sa 5:1).

to turn the kingdom of Saul to him, according to the word of the Lord--(1Ch 10:14; 11:3, 10). The account commences with the southern tribes, Levi being associated with Judah and Simeon, as the great majority of the leading men in this tribe resided in Judah; and, after recounting the representatives of the northern tribes, it concludes with those on the east of Jordan.