1 Chronicles 11:4-9

Then David and all Israel went to Jerusalem (that is Jebus); and the Jebusites, the inhabitants of the land, were there. Then the Jebusites said to David, “You shall not come in here.” But David captured the stronghold of Zion (that is, the City of David). Now David said, “Whoever strikes down a Jebusite first shall be chief and commander.” Joab the son of Zeruiah [David’s half sister] went up first, and so he was made chief. Then David lived in the stronghold; so it was called the City of David. He built the city around it, from the Millo (fortification) to the surrounding area; and Joab repaired the rest of the [old Jebusite] city. David became greater and greater, for the LORD of hosts was with him.