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evangelist said:
1Th:5:23: And the very God of peace sanctify you wholly; and I pray God your whole spirit and soul and body be preserved blameless unto the coming of our Lord Jesus Christ.

Notice the three parts
1.YOUR spirit.
2.YOUR soul
3.Your body meaning yours which belongs to you which is biblically three part which is yours.

These terms are not defined by this verse. It is God's Spirit which is infallible and perfect. Our spirit is "preserved blameless" along with "body and soul." You claim that the human spirit of a believer is infallible, but this verse doesn't say that. Nor does any other passage of Scripture.

The only way to define these terms is to compare Scripture with Scripture. Not look up the word in a 21st century dictionary, nor theorize on what it means to you.

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Ec:12:7: Then shall the dust return to the earth as it was: and the spirit shall return unto God who gave it.

But Ecc 12:7 doesn't say what happens to the soul. It describes two things: "Dust" and spirit.

In the same book the author Solomon also writes,

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For the fate of the sons of men and the fate of beasts is the same. As one dies, so dies the other; indeed, they all have the same breath and there is no advantage for man over beast, for all is vanity. All go to the same place. All came from the dust and all return to the dust. Who knows that the breath of man ascends upward and the breath of the beast descends downward to the earth (Ecclesiastes 3:19-21)?

Now if you insist on taking every passage of Scripture literally, then how do you resolve the apparent contradiction between this passage and the ones you use to describe an infallible and immortal human spirit (the inner man, or invisible part) in addition to body and soul (the outer man, or that which we can see)?

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Proverb:20:27: The spirit of man is the candle of the LORD, searching all the inward parts of the belly.

I still see only two "parts" mentioned here; spirit and belly. The words "spirit," "breath," "life," and "soul" are most often interchangable in both Testaments.

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So the scriptures show we have a spirit in us which is a part of you. We know we have a soul, and third they both live in a body. So how many part does the bible teaches we have?

None of the Scriptures you quoted teach any such thing! But instead of proving anything, you simply re-state the same thesis over and over again, as if you can win the argument by mere repetition.

So explain why Ecclesiastes 3:19-21 should not be interpreted in the same way you have interpreted 1st Thessalonians 5:23.