When Jesus returns in person, He will sit on the throne of David. Because the throne of David is in the Temple, it means that a third temple will be built. This will be the temple taken over by the AntiChrist, which is the abomination of desolation described by Luke. Matthew's description involves the desecration and destruction of the temple by the Romans in AD70.
We, as Gentiles won't be financially contributing to the building of the temple because it is the Jewish temple and therefore will be financed and built by the Jews. Apparently there are negotiations going on to reserve a part of the temple mount on which the new temple will be built.
We need to know that the Church has not replaced Israel. God has a plan for both. Replacement theology was instituted by anti-Semitic theologians who teach that the Church is the new Israel. But it is quite clear in Revelation, that when Jesus returns in person, He will return to Israel and take the throne of David in the temple. The 1000 year reign will be from Israel. The Christian church will not be involved. They will be elsewhere until the end of the 1000 year reign and then will be witnesses to the second resurrection involving unbelievers, and the great White Throne judgment.
When the New Jerusalem comes down from heaven. the remnant of Israel plus the bride of Christ will be merged, and all will be one under Christ. Then Christ will hand the kingdom back to the Father and we will enter into the joys of the Lord for eternity.
The throne of David is equal to Yahweh's throne, the true "David's" throne. Christ being the true David and the true king of Israel.
2 Chronicles 9:
8Blessed be the LORD your God, who has delighted in you to set you on His throne to be king for the LORD your God. Because your God loved Israel enough to establish them forever, He has made you king over them to carry out justice and righteousness."
1 Chronicles 29:
23Then Solomon sat on the throne of the LORD as king in place of David his father. And he prospered, and all Israel obeyed him.
He was declared the "king of Israel" John 1:49
Matt 28:18Then Jesus came to them and said, “All authority in heaven and on earth has been given to Me.
Acts 2:25-36 Peter shows how Jesus fulfilled the promise to David of sitting on his throne.
Everyone knows the following. The question is; was the government put upon His shoulders? and has it increased? and when will it end?
Isaiah 9:
6For unto us a child is born,
unto us a son is given,
and the government will be upon His shoulders.
And He will be called
Wonderful Counselor, Mighty God,
Everlasting Father, Prince of Peace.
7Of the increase of His government and peace
there will be no end.
He will reign on the throne of David
and over his kingdom,
to establish and sustain it
with justice and righteousness
from that time and forevermore.
The zeal of the LORD of Hosts will accomplish this.