The time came when King David and his men set out to attack Jerusalem. The Jebusites, who lived there, thought that David would not be able to conquer the city, and so they said to him, "You will never get in here; even the blind and the crippled could keep you out." 1
References for 2 Samuel 5:6
1.6-10 1 S 31.1-6; 1 Ch 10.1-6.