4 Then David and all Israel went to Jerusalem (or Jebus, as it used to be called), where the Jebusites, the original inhabitants of the land, were living. 5 The people of Jebus taunted David, saying, "You'll never get in here!" But David captured the fortress of Zion, which is now called the City of David. 6 David had said to his troops, "Whoever is first to attack the Jebusites will become the commander of my armies!" And Joab, the son of David's sister Zeruiah, was first to attack, so he became the commander of David's armies.
Matthew Henry's Commentary on 1 Chronicles 11:4-6
Commentary on 1 Chronicles 11:1-9
(Read 1 Chronicles 11:1-9)
David was brought to possess the throne of Israel after he had reigned seven years in Hebron, over Judah only. God's counsels will be fulfilled at last, whatever difficulties lie in the way. The way to be truly great, is to be really useful, to devote all our talents to the Lord.