Then the Lord will fight against those nations who come against Jerusalem.
God is very clear on this subject that when it comes to the nation of Israel/Jerusalem.
There is no grace for those who come against His people.
All nations will be judged by this act.

Yeshua will build up Zion.
He shall appear in His Glory!
Psalm 102:16
When the LORD shall build up Zion, he shall appear in his glory.

The LORD does build up Jerusalem: he gathers together the outcasts of Israel.
Psalm 147:2

Scattered, Gathered and Reborn!

Ezekiel 39:28
Then shall they know that I am the LORD their God, which caused them to be led into captivity among the heathen:
but I have gathered them to their own land, and have left none of them any more there.