Romans 9:33

in agreement with the statement of Scripture, "See, I am placing on Mount Zion a stone for people to stumble at, and a rock for them to trip over, and yet he whose faith rests upon it shall never have reason to feel ashamed."

Hebrews 12:22

On the contrary you have come to Mount Zion, and to the city of the ever-living God, the heavenly Jerusalem, to countless hosts of angels,

Revelation 14:1

Then I looked, and I saw the Lamb standing upon Mount Zion, and with Him 144,000 people, having His name and His Father's name written on their foreheads.

Treasury of Scripture Knowledge

Summary

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.

Bible References

The castle

Romans 9:33
in agreement with the statement of Scripture, "See, I am placing on Mount Zion a stone for people to stumble at, and a rock for them to trip over, and yet he whose faith rests upon it shall never have reason to feel ashamed."
Hebrews 12:22
On the contrary you have come to Mount Zion, and to the city of the ever-living God, the heavenly Jerusalem, to countless hosts of angels,
Revelation 14:1
Then I looked, and I saw the Lamb standing upon Mount Zion, and with Him 144,000 people, having His name and His Father's name written on their foreheads.