Quote the scripture that says that please?
I have read and taught through the Bible several times in the past almost 60 years. And John the revelator does not show "all the nations emerging repentant from the fire to enter into the City of God for worship and healing."
In Rev. 21 vss. 4 through 8 are one continuous narrative. The events occur in they way they are listed. The narrative cannot be broken up and parts said to happen at an earlier time.
.....If "all the nations emerging repentant from the fire to enter into the City of God for worship and healing." then the following verses cannot be true.
Revelation 21:4-8
(4) And God shall wipe away all tears from their eyes; and there shall be no more death, neither sorrow, nor crying, neither shall there be any more pain: for the former things are passed away.
(5) And he that sat upon the throne said, Behold, I make all things new. And he said unto me, Write: for these words are true and faithful.
(6) And he said unto me, It is done. I am Alpha and Omega, the beginning and the end. I will give unto him that is athirst of the fountain of the water of life freely.
(7) He that overcometh shall inherit all things; and I will be his God, and he shall be my son.
(8) But the fearful, and unbelieving, and the abominable, and murderers, and whoremongers, and sorcerers, and idolaters, and all liars, shall have their part in the lake which burneth with fire and brimstone: which is the second death.
Vs. 4 no more death.
Vs. 5 "I make all things new."
But in vs. 8 eight groups of people are thrown into the lake of fire which is the second death.
Revelation 21:27 And there shall in no wise enter into it [new Jerusalem vs. 2] any thing that defileth, neither whatsoever worketh abomination, or maketh a lie: but they which are written in the Lamb's book of life.
Revelation 22:14-15
(14) Blessed are they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.
(15) For without are dogs, and sorcerers, and whoremongers, and murderers, and idolaters, and whosoever loveth and maketh a lie.