has practically dismissed these passages and others in all modern English versions of the bible since 1880. ALL modern translation use Greek manuscripts based on codices Sinaiticus and Vaticanus. They are different then what the KJV is translated from. That is why there are so many differences between the modern versions and the KJV.
Codices Sinaiticus and Vaticanus are fourth century documents. They are considered the oldest complete manuscripts in existence. They are hailed as the best and most accurate. It is these two manuscripts that are referenced when you hear bible scholars say the best and most accurate manuscripts don't have such and such.
Google them. Here are afew to get you started.
This one covers your original question: http://www.chick.com/information/bibleversions/articles/king...
Hope this helped
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