It always surprises me how obvious prove of well-known Scripture, is overlooked during seemingly endless debates looking elsewhere.
When the Son of man shall come in his glory, and all the holy angels with him, then shall he sit upon the throne of his glory:
And before him shall be gathered all nations: and he shall separate them one from another, as a shepherd divideth his sheep from the goats:
This is called the judgment of nations, because it's the Lord judging the nations of earth after coming in His glory.
It's the nations being judged between sheep and goats.
All people from all nations will be there to realize their eternal fate.
I will let the Lord explain what happens to both groups...,
Bolded and underlined.,
Matt 25:
31 “But when the Son of Man comes in His glory
and majesty and all the angels with Him, then He will sit on the throne of His glory. 32 All the nations will be gathered before Him [for judgment]; and He will separate them from one another, as a shepherd separates his sheep from the goats; 33 and He will put the sheep on His right [the place of honor], and the goats on His left [the place of rejection].
34 “Then the King will say to those on His right, ‘Come, you blessed of My Father [you favored of God, appointed to eternal salvation], inherit the kingdom prepared for you from the foundation of the world.
35 For I was hungry, and you gave Me something to eat; I was thirsty, and you gave Me
something to drink; I was a stranger, and you invited Me in; 36
I was naked, and you clothed Me; I was sick, and you visited Me [with help and ministering care]; I was in prison, and you came to Me [ignoring personal danger].’ 37 Then the righteous will answer Him, ‘Lord, when did we see You hungry, and feed You, or thirsty, and give You something to drink? 38 And when did we see You as a stranger, and invite You in, or naked, and clothe You? 39 And when did we see You sick, or in prison, and come to You?’ 40 The King will answer and say to them, ‘I assure you
and most solemnly say to you, to the extent that you did it for one of these brothers of Mine,
even the least
of them, you did it for Me.’
41 “Then He will say to those on His left, ‘Leave Me, you cursed ones, into the eternal fire which has been prepared for the devil and his angels (demons);
42 for I was hungry, and you gave Me
nothing to eat; I was thirsty, and you gave Me nothing to drink; 43 I was a stranger, and you did not invite Me in; naked, and you did not clothe Me; sick, and in prison, and you did not visit Me [with help and ministering care].’ 44 Then they also [in their turn] will answer, ‘Lord, when did we see You hungry, or thirsty, or as a stranger, or naked, or sick, or in prison, and did not minister to You?’ 45 Then He will reply to them, ‘I assure you
and most solemnly say to you, to the extent that you did not do it for one of the least of these [my followers], you did not do it for Me.’
46 Then these [unbelieving people] will go away into eternal (unending) punishment, but those who are righteous and in right standing with God [will go, by His remarkable grace] into eternal (unending) life.”
This is clearly the FINAL judgment.
It's not a judgement of saved saints, that are already resurrected to meet Him in the air, with power given to reign with Him over those nations.
The judgement of nations on earth, is the judgment of nations, not the judgement of resurrected saints.
It is a Final judgment of either unending glory or unending misery...see bolded and underlined above.
All who have ever believed will be raised and glorified on this day.
2Tim 4
7 I have fought the good
and worthy
and noble fight, I have finished the race, I have kept the faith [firmly guarding the gospel against error].
8 In the future there is reserved for me the [victor’s] crown of righteousness [for being right with God and doing right], which the Lord, the righteous Judge, will award to me on that [great] day—and not to me only, but also to all those who have loved and longed for and welcomed His appearing.