I don't know where it is but it was Paul who said it, that he was taken to the 3rd heaven. You could Google it And find the verse. And also, in the beginning, God created the heavens (plural).
It wasn't Paul who was taken up to the 3rd heaven, but rather that he knew of such a man who made that claim.
2 Cor. 12
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2]
I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth;)
such an one caught up to the third heaven.
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3] And I knew such a man, (whether in the body, or out of the body, I cannot tell: God knoweth;)
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4]
How that he was caught up into paradise, and heard unspeakable words, which it is not lawful for a man to utter.
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5] Of such an one will I glory: yet of myself I will not glory, but in mine infirmities.
> Paul was not endorsing the man's claim, as being real or false. He was only reiterating what the man claimed that he saw and heard.
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Paul even states that he himself didn't know whether the man's experience was of God or it wasn't. "And I knew such a man, (whether in the body, or out of the body, I cannot tell: God knoweth"
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IOW's, Paul didn't judge the reality of the man's experience, but left it to God, by saying "God knoweth".
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Now notice what Paul said: "[
1] It is not expedient for me doubtless to glory.
I will come to visions and revelations of the Lord. Of such an one will I glory: yet of myself I will not glory, but in mine infirmities."
IOWs, Paul could praise God for the man's vision or experience being shared to him, but in himself, he remained content in the Lord, in dealing with his own infirmities (weaknesses).
In what ever state Paul was in, he was fine with that.
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Therefore, his conclusion was: "For though I would desire to glory, I shall not be a fool; for I will say the truth: but now I forbear, lest any man should think of me above that which he seeth me to be, or that he heareth of me."