2 Samuel 5:6

Went to Jerusalem. — The king of Jerusalem had been defeated and slain by Joshua (Joshua 10:23; Joshua 12:10), and the city had been subsequently taken and destroyed by Judah (Judges 1:7). It was, however, only partially occupied by the tribes of Judah and Benjamin (Judges 1:21; Judges 15:63), and at a later time fell again entirely into the hands of the Jebusites (Judges 19:11). That Jebus and Jerusalem were two names of the same city is stated in 1 Chronicles 11:4. This expedition must have taken place immediately after the coronation, since the length of reign over all Israel and of the reign in Jerusalem are said in 2 Samuel 5:5 to be the same. David doubtless saw the importance of at once uniting the tribes in common action as well as the advantages of Jerusalem for his capital (Hebron being much too far southward), and the necessity of dislodging this remnant of the old Canaanites from their strong position in the centre of the land.

Except thou take away. — A better translation is, Thou shalt not come hither; but the blind and the lame shall keep thee off. The Jebusites, confident in the natural strength of their fortress, boast that even the lame and the blind could defend it. Their citadel was upon Mount Zion, the highest of the hills of Jerusalem, south-west of the temple hill of Moriah, and surrounded on three sides by deep valleys.