1 Chronicles 11:4-8

4David and all the Israelites marched to Jerusalem (that is, Jebus). The Jebusites who lived there 5said to David, “You will not get in here.” Nevertheless, David captured the fortress of Zion—which is the City of David. 6David had said, “Whoever leads the attack on the Jebusites will become commander in chief.” Joab son of Zeruiah went up first, and so he received the command. 7David then took up residence in the fortress, and so it was called the City of David. 8He built up the city around it, from the terraces to the surrounding wall, while Joab restored the rest of the city.