Romans 9:33

as the Scripture says, "See, I will put a stone on Zion to make people stumble, and a rock to trip over, But no one who has faith in it will be disappointed."

Hebrews 12:22

But you have come up to Mount Zion, to the city of the living God, the heavenly Jerusalem, to countless angels,

Revelation 14:1

Then in my vision I saw the Lamb standing on Mount Zion, and with him 144,000 people who had 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
as the Scripture says, "See, I will put a stone on Zion to make people stumble, and a rock to trip over, But no one who has faith in it will be disappointed."
Hebrews 12:22
But you have come up to Mount Zion, to the city of the living God, the heavenly Jerusalem, to countless angels,
Revelation 14:1
Then in my vision I saw the Lamb standing on Mount Zion, and with him 144,000 people who had his name and his Father's name written on their foreheads.