11:5 And the inhabitants of Jebus said to David, Thou shalt not come hither. Nevertheless David took the castle of Zion, which is the city of David.
castle of Zion
(1) Zion, the ancient Jebusite stronghold, is the southwest eminence in Jerusalem, called in Scripture the city of David, and associated with the Davidic royalty both historically and prophetically 1 Chronicles 11:7 ; Psalms 2:6 ; Isaiah 2:3 . The word is often used of the whole city of Jerusalem considered as the city of God Psalms 48:2 Psalms 48:3 especially in passages referring to the future kingdom-age ; Isaiah 1:27 ; 2:3 ; 4:1-6 ; Joel 3:16 ; Zechariah 1:16 Zechariah 1:17 ; 8:3-8 ; Romans 11:26 . In Hebrews 12:22 the word is used symbolically of heaven.
(2) In Deuteronomy 4:48 the name is given to a projection or peak of Mount Hermon.