Romans 9:33

as it is written; Behold, I lay in Zion a stone of stumbling and a rock of offense, and he that believes on him shall not be ashamed.

Revelation 14:1

AND I saw, and behold, the Lamb stood on Mount Zion, and with him a hundred and forty-four thousand having his name and the name of his father 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 it is written; Behold, I lay in Zion a stone of stumbling and a rock of offense, and he that believes on him shall not be ashamed.
Revelation 14:1
AND I saw, and behold, the Lamb stood on Mount Zion, and with him a hundred and forty-four thousand having his name and the name of his father written on their foreheads.