The king and his men marched to Jerusalem against the Jebusites who inhabited the land. The Jebusites had said to David: "You will never get in here. Even the blind and lame can repel you," thinking, "David can't get in here."
References for 2 Samuel 5:6
Yet David did capture the stronghold of Zion, the city of David.
He said that day, "Whoever attacks the Jebusites must go through the water shaft to reach the lame and the blind who are despised by David." For this reason it is said, "The blind and the lame will never enter the house."
References for 2 Samuel 5:8
David took up residence in the stronghold, which he named the city of David. He built it up all the way around from the supporting terraces inward.
References for 2 Samuel 5:9
David became more and more powerful, and the Lord God of Hosts was with him.
References for 2 Samuel 5:10