'Holy City' in the Bible

But the court which is without the temple cast out and measure it not: for it is given to the Gentiles: and they shall tread the holy city forty two months.

And I saw the holy city, the new Jerusalem, coming down from God out of heaven, prepared as a bride, adorned for her husband.

And he carried me away in the spirit to a great and high mountain, and shewed me the holy city Jerusalem, descending out of heaven from God,

And if any man shall take away from the words of the book of this prophecy, God shall take away his part of the tree of life, and the holy city, which are written in this book.