David Conquers Jerusalem

6 The king and his men marched to Jerusalem to attack the Jebusites, who lived there. The Jebusites said to David, “You will not get in here; even the blind and the lame can ward you off.” They thought, “David cannot get in here.”

Read 2 Samuel 5:6 Using Other Translations

And the king and his men went to Jerusalem unto the Jebusites, the inhabitants of the land: which spake unto David, saying, Except thou take away the blind and the lame, thou shalt not come in hither: thinking, David cannot come in hither.
And the king and his men went to Jerusalem against the Jebusites, the inhabitants of the land, who said to David, "You will not come in here, but the blind and the lame will ward you off"--thinking, "David cannot come in here."
David then led his men to Jerusalem to fight against the Jebusites, the original inhabitants of the land who were living there. The Jebusites taunted David, saying, “You’ll never get in here! Even the blind and lame could keep you out!” For the Jebusites thought they were safe.