1 Chronicles 11:5-8

5The inhabitants of Jebus said to David, “You will not come in here.” Nevertheless, David took the stronghold of Zion, that is, the city of David. 6David said, “Whoever strikes the Jebusites first ashall be chief and commander.” And Joab the son of Zeruiah went up first, so he became chief. 7And David lived in the stronghold; therefore it was called the city of David. 8And he built the city all around from the Millo in complete circuit, and Joab repaired the rest of the city.
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