Speaking of some of the saints who were temporarily restored to physical life to testify about Yeshua's resurrection, after jealous Jewish leaders delivered Him to the bloody Romans to murder, we find, by inspiration of the Holy Spirit:
...and coming out of the graves after His resurrection, they went into THE HOLY CITY and appeared to many.
Paul, speaking of the imminent Third Temple, the holy TEMPLE OF GOD (the Temple of God -- not just of the Jews or any other conspiracy theory that contradicts Scripture), that Europe's wannabe divine emperor will pollute, coveting it since Satan knows (even if some religious folks don't) it is the TEMPLE OF GOD:
2 Thessalonians 2:4
...who opposes and exalts himself above all that is called God or that is worshiped, so that he sits as God in the TEMPLE OF GOD, showing himself that he is God.
Speaking of the imminent Third Temple and EU occupation of Jerusalem (whose days are numbered when they trespass upon the Temple Mount), and simultaneous ministry of the Two Witnesses, the apostle John was inspired by the Holy Spirit to foretell:
1 Then I was given a reed like a measuring rod. And the angel stood, saying, 'Rise and measure the TEMPLE OF GOD [not merely of the Jews or of the Masons or Illuminati or whoever some slander], the altar, and those who worship there. 2 But leave out the court which is outside the temple, and do not measure it, for it has been given to the Gentiles. And they will tread THE HOLY CITY underfoot for forty-two months. 3 And I will give power to my two witnesses, and they will prophesy one thousand two hundred and sixty days, clothed in sackcloth.
Speaking of the imminent clash between Catholic Europe and Islam with Jerusalem's holy Temple Mount caught in the middle:
At the time of the end the king of the South shall attack him; and the king of the North shall come against him like a whirlwind, with chariots, horsemen, and with many ships; and he shall enter the countries, overwhelm them, and pass through. 41 He shall also enter the Glorious Land, and many countries shall be overthrown; but these shall escape from his hand: Edom, Moab, and the prominent people of Ammon. 42 He shall stretch out his hand against the countries, and the land of Egypt shall not escape. 43 He shall have power over the treasures of gold and silver, and over all the precious things of Egypt; also the Libyans and Ethiopians shall follow at his heels. 44 But news from the east and the north shall trouble him; therefore he shall go out with great fury to destroy and annihilate many. 45 And he shall plant the tents of his palace between the seas and the glorious holy mountain; yet he shall come to his end, and no one will help him.
Jerusalem is holy in the biblical sense it has been called to fulfill its awesome calling to become the City of our God, the City of the Great King. It has been sanctified, set apart for a holy purpose that it will soon fulfill. It is holy, even though it is a sinful city, just like Israel and Judah are holy, set apart, sanctified, and need to learn to live holy lives.
The New Jerusalem doesn't come down from Heaven until after the initial thousand year reign of Christ who will subdue all opposition and destroy all enemies, including death and Satan when the Earth is purified by fire. Then the Father comes with New Jerusalem -- the Sabbath-keeping Church of God is a type of it.
Meanwhile, we pray for Judah and intercede for Jerusalem:
1 For Zion’s sake I will not hold My peace,
And for Jerusalem’s sake I will not rest,
Until her righteousness goes forth as brightness,
And her salvation as a lamp that burns.
2 The Gentiles shall see your righteousness,
And all kings your glory.
You shall be called by a new name,
Which the mouth of the LORD will name.
6 I have set watchmen on your walls, O Jerusalem;
They shall never hold their peace day or night.
You who make mention of the LORD, do not keep silent,
7 And give Him no rest till He establishes
And till He makes Jerusalem a praise in the earth.
These watchmen are the Two Witnesses of Revelation 11 -- Two Witnesses who will testify in Jerusalem against Europe. They will announce to the cities of Judah and comfort captive Israel (all Twelve Tribes) that our God will come and save us.
4 Say to those who are fearful-hearted,
"Be strong, do not fear!
Behold, your God will come with vengeance,
With the recompense of God;
He will come and save you."
9 And it will be said in that day:
"Behold, this is our God;
We have waited for Him, and He will save us.
This is the LORD;
We have waited for Him;
We will be glad and rejoice in His salvation."