John Gill's Bible Commentary Ver. 5. In Hebron he reigned over Judah seven years and six months , etc.] So long the kingdom of Israel continued in the house of Saul after his death; and by this it appears that David was near thirty eight years of age when the elders of Israel came and made him their king: and in Jerusalem he reigned thirty and three years over all Israel and Judah ; which in all made forty years and six months, (see 1 Kings 2:11); upon his being made king over all the tribes, as soon as he had taken the strong hold of Zion, which he immediately attacked, as follows, he removed the seat of his kingdom from Hebron to Jerusalem.
Matthew Henry Commentary
Verses 1-5 - David was anointed king a third time. His advances were gradual, tha his faith might be tried, and that he might gain experience. Thus his kingdom typified that of the Messiah, which was to come to its heigh by degrees. Thus Jesus became our Brother, took upon him our nature dwelt in it that he might become our Prince and Saviour: thus the humbled sinner takes encouragement from the endearing relation, applie for his salvation, submits to his authority, and craves his protection.
Original Hebrew בחברון2275 מלך4427 על5921 יהודה3063 שׁבע7651 שׁנים8141 ושׁשׁה8337 חדשׁים2320 ובירושׁלם3389 מלך4427 שׁלשׁים7970 ושׁלשׁ7969 שׁנה8141 על5921 כל3605 ישׂראל3478 ויהודה׃3063