It's called holy in Rev 11, which is in the future at the start of the GT. It's called holy not because of the people but the land/area which is holy to God.
Zec_2:12 And the LORD shall inherit Judah his portion in the holy land, and shall choose Jerusalem again.
"Promised Land Inheritence" Will Be Fulfilled In The New Heaven, And Earth
The Eternal Kingdom is seen in Ezekiel Chapters 47-48 regarding the division of land for inheritance in the "New Heaven, Earth, Jerusalem"
"The Eternal Kingdom, In The New Heaven And Earth" Where The New Jerusalem, And The River/Tree Of Life Are Present
Revelation 22:1-2KJV
And he shewed me a pure river of water of life, clear as crystal, proceeding out of the throne of God and of the Lamb.
2
In the midst of the street of it, and on either side of the river, was there the tree of life, which bare twelve manner of fruits, and yielded her fruit every month: and the leaves of the tree were for the healing of the nations.
Ezekiel 47:12-14KJV
12
And by the river upon the bank thereof, on this side and on that side, shall grow all trees for meat, whose leaf shall not fade, neither shall the fruit thereof be consumed: it shall bring forth new fruit according to his months, because their waters they issued out of the sanctuary: and the fruit thereof shall be for meat, and the leaf thereof for medicine.
13
Thus saith the Lord God; This shall be the border, whereby ye shall inherit the land according to the twelve tribes of Israel: Joseph shall have two portions.
14 And ye shall inherit it, one as well as another: concerning the which I lifted up mine hand to give it unto your fathers: and
this land shall fall unto you for inheritance.
"The Eternal New Jerusalem"
Ezekiel 48:29-35KJV
29
This is the land which ye shall divide by lot unto the tribes of Israel for inheritance, and these are their portions, saith the Lord God.
30 And these are the goings out of the city on the north side, four thousand and five hundred measures.
31 And
the gates of the city shall be after the names of the tribes of Israel: three gates northward; one gate of Reuben, one gate of Judah, one gate of Levi.
"The Eternal New Jerusalem"
Revelation 21:10-12KJV
10 And he carried me away in the spirit to a great and high mountain, and shewed me that great city, the holy Jerusalem, descending out of heaven from God,
11 Having the glory of God: and her light was like unto a stone most precious, even like a jasper stone, clear as crystal;
12 And had a wall great and high, and
had twelve gates, and at the gates twelve angels, and names written thereon, which are the names of the twelve tribes of the children of Israel:
