Our ever after life is on a new earth...
Yes, it is.
II Peter chapter 3
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10] But the day of the Lord will come as a thief in the night; in the which the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the earth also and the works that are therein shall be burned up.
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11] Seeing then that all these things shall be dissolved, what manner of persons ought ye to be in all holy conversation and godliness,
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12] Looking for and hasting unto the coming of the day of God, wherein the heavens being on fire shall be dissolved, and the elements shall melt with fervent heat?
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Nevertheless we, according to his promise, look for new heavens and a new earth, wherein dwelleth righteousness.
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14] Wherefore, beloved, seeing that ye look for such things, be diligent that ye may be found of him in peace, without spot, and blameless.
Again:
Revelation chapter 20
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11]
And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them.
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12] And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.
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13] And the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works.
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14] And death and hell were cast into the lake of fire. This is the second death.
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15] And whosoever was not found written in the book of life was cast into the lake of fire.
Revelation chapter 21
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1]
And I saw a new heaven and a new earth: for the first heaven and the first earth were passed away; and there was no more sea.
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2]
And I John saw the holy city, new Jerusalem, coming down from God out of heaven, prepared as a bride adorned for her husband.
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3]
And I heard a great voice out of heaven saying, Behold, the tabernacle of God is with men, and he will dwell with them, and they shall be his people, and God himself shall be with them, and be their God.
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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.
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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.
Is the judgment seat of Christ not in "Heaven"?
No, it is not.
It will be right here on earth.
Matthew chapter 25
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31]
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:
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32]
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:
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33] And he shall set the sheep on his right hand, but the goats on the left.
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34] Then shall the King say unto them on his right hand, Come, ye blessed of my Father, inherit the kingdom prepared for you from the foundation of the world:
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35] For I was an hungred, and ye gave me meat: I was thirsty, and ye gave me drink: I was a stranger, and ye took me in:
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36] Naked, and ye clothed me: I was sick, and ye visited me: I was in prison, and ye came unto me.
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37] Then shall the righteous answer him, saying, Lord, when saw we thee an hungred, and fed thee? or thirsty, and gave thee drink?
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38] When saw we thee a stranger, and took thee in? or naked, and clothed thee?
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39] Or when saw we thee sick, or in prison, and came unto thee?
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40] And the King shall answer and say unto them, Verily I say unto you, Inasmuch as ye have done it unto one of the least of these my brethren, ye have done it unto me.
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41] Then shall he say also unto them on the left hand, Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:
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42] For I was an hungred, and ye gave me no meat: I was thirsty, and ye gave me no drink:
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43] I was a stranger, and ye took me not in: naked, and ye clothed me not: sick, and in prison, and ye visited me not.
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44] Then shall they also answer him, saying, Lord, when saw we thee an hungred, or athirst, or a stranger, or naked, or sick, or in prison, and did not minister unto thee?
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45] Then shall he answer them, saying, Verily I say unto you, Inasmuch as ye did it not to one of the least of these, ye did it not to me.
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46] And these shall go away into everlasting punishment: but the righteous into life eternal.