Sinaiticus and Vaticanus
When someone "corrects" the King James Bible with "more authoritative manuscripts" or "older manuscripts," or "the best authorities," they're usually making some reference to Sinaiticus or Vaticanus. These are two very corrupt fourth century uncials that are practically worshipped by modern scholars. These are the primary manuscripts that Westcott and Hort relied so heavily on when constructing their Greek text (1851-1871) on which the new versions are based.
Vaticanus (B) is the most worshipped. This manuscript was officially catalogued in the Vatican library in 1475, and is still property of the Vatican today. Siniaticus (Aleph) was discovered in a trash can at St. Catherine's Monastery on Mt. Sinai by Count Tischendorf, a German scholar, in the year 1844. Both B and Aleph are Roman Catholic manuscripts.
Remember that! You might also familiarize yourself with the following facts:
1. Both manuscripts contain the Apocrypha as part of the Old Testament.
2. Tischendorf, who had seen both manuscripts, believed they were written by the same man, possibly Eusebius of Caesarea (260-340 A.D.).
3. Vaticanus was available to the King James translators, but God gave them sense enough to ignore it.
4. Vaticanus omits Geneses 1:1-46; 28, Psalm 106-138, Matthew 16:2-3, Rom. 16:24, I Timothy through Titus, the entire book of Revelation, and it conveniently ends the book of Hebrews at Hebrews 9:14. If you're familiar with Hebrews 10, you know why.
5. While adding The Epistle of Barnabas and The Shepherd of Hermas to the New Testament, Siniaticus omits John 5:4, 8:1-11, Matthew 16:2-3, Romans 16:24, Mark 16:9-20, Acts 8:37, and I John 5:7 (just to name a few).
6. It is believed that Siniaticus has been altered by as many as ten different men. Consequently, it is a very sloppy piece of work (which is probably the reason for it being in a trash can). Many transcript errors, such as missing words and repeated sentences are found throughout it.
7. The Dutch scholar, Erasmus (1469-1536), who produced the world's first printed Greek New Testament, rejected the readings of Vaticanus and Siniaticus.
8. Vaticanus and Siniaticus not only disagree with the Majority Text from which the KJV came, they also differ from each other. In the four Gospels alone, they differ over 3,000 times!
9. When someone says that B and Aleph are the oldest available manuscripts, they are lying. There are many Syriac and Latin translations from as far back as the SECOND CENTURY that agree with the King James readings. For instance, the Pashitta (145 A.D.), and the Old Syriac (400 A.D.) both contain strong support for the King James readings. There are about fifty extant copies of the Old Latin from about 157 A.D., which is over two hundred years before Jerome was conveniently chosen by Rome to "revise" it. Then Ulfilas produced a Gothic version for Europe in A.D. 330. The Armenian Bible, which agrees with the King James, has over 1,200 extant copies and was translated by Mesrob around the year 400. Sinaiticus and Vaticanus are clearly NOT the oldest and best manuscripts.