Do you really need proof ?
Bible is cahnging even today.
Table documenting over 300 verses changed in the new versions.
Table documenting complete verses removed in the new versions.
Table documenting 15 major Bible words removed in the new versions.
The New King James Bible: Counterfeit.
http://www.av1611.org/biblecom.html
A simple example is the trinity verse :
Other Bible Versions Omit Trinity Verse
For there are three that testify: the Spirit and the water and the blood; and the three are in agreement.(1 John 5:7-8 NASB), see footnote below.) For there are three that testify: [ii] the Spirit, the water and the blood; and the three are in agreement. (1 John 5:7-8 NIV, see footnote [ii] below.) And the Spirit is the witness, because the Spirit is the truth. There are three witnesses, the Spirit, the water, and the blood; and these three agree. (1 John 5:7-8 RSV)
Biblical Footnotes Rejecting Trinity Verse
A few late manuscripts add ... "in heaven, the Father, the Word, and the Holy Spirit, and these three are one. And there are three that testify on earth, the Spirit".
[ii] Late manuscripts of the Vulgate: "in heaven: the Father, the Word and the Holy Spirit, and these three are one. And there are three that testify on earth:" (not found in any Greek manuscript before the sixteenth century.)
Naive bible-believers often mistake footnotes in their Bibles as accepted alternative translations, endorsed by the editors of that version; this is far from the truth. The footnotes above are evidence that the editors of the New American Standard Bible and New International Version recognize that the Comma is fraudulent, and not worthy of being in their Bible. In support of our comments above, these editors note that the Comma appears only in "later manuscripts", which means they accept the notion that the comma was added long after the inspired writers of the Bible had completed their work.
King James Bible Accepts Trinity Verse