The words of the LORD are pure words: as silver tried in a furnace of earth, purified seven times.
Thou shalt keep them, O LORD, thou shalt preserve them from this generation for ever.
Could it be otherwise?
No doubt there are "translations" that have been tampered with, the New World Translation of the Jehovah's Witnesses immediately comes to mind, but it is a matter of record and examination to find these out for God has preserved His word, we have accurate translations that any who should seek Him might find Him, just as He promises :
And ye shall seek me, and find me, when ye shall search for me with all your heart.
And I will be found of you, saith the LORD.
The Bible is the only writing that enables communion with God and thereby authenticates itself.
That which we have seen and heard declare we unto you, that ye also may have fellowship with us: and truly our fellowship is with the Father, and with his Son Jesus Christ.
And these things write we unto you, that your joy may be full.
God witnesses to the truth. That is what countless have found including the record of many godly people who have gone before us preferring to lose their lives rather than deny the truth, and also those today who are murdered for their holding to the truth, but whose testimony many seek to ignore or dismiss.
If you knew God you would know that it is His word and the converse is obvious, that those who deny the Bible do not know God.
It should hardly need pointing out that those who do not know God are not in the best position to know His word, but sadly it needs to be brought to attention.
Many commit the most ridiculous and foolish error of saying that because they do not know God they must know better, for that is the logical consequence of denying the Bible.
If they had sufficient humility they would have to confess that they did not know, whereas those to whom it has been revealed can only confess that they do know, with greater humility, by His immense grace.
Of course there are some who will claim to know God but their lives bear an opposite testimony and do not match the Bible's teaching nor show the work of God.
God is not mocked and in His wisdom He has so ordered things that the state of every one's heart is shown, most particularly by their response to His word, The Bible.
And this is the condemnation, that light is come into the world, and men loved darkness rather than light, because their deeds were evil.
For every one that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved.
It remains for you to seek the light, may it earnestly be, rather than be proved a lover of darkness.