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There are a lot of these, many of which are found among Protestant translations and/or editions of the Bible. For example, one such edition inserts the letter "a" into the First Chapter of St. John, such that the erroneous version says, "In the beginning was the Word and the Word was with God, and the Word was a God." From there, they proceeded to teach their heresy that man matures in his lifetime to then become "a god" when he dies, and from there goes off to start his own universe somewhere. This was a recent corruption and is found as I recall offhand in the Mormons' so-called bible.
This hearkens to a previous age, and the beginning of the 4th century Arian heresy, which actually endures to this day, even though it was crushed over a thousand years ago. For there too, the insertion of only one letter into one word, changed the meaning of Our Lord's essential divinity into Our Lord's ambiguous co-operation with the divine, and therefore the false doctrine that Jesus was not God. The Greek word, Homoousion -- meaning "of same substance," which is equivalent to our "consubstantial" from the Latin "consubstantialem," of one essence or substance -- was corrupted by the addition of the one letter, "i," to make it Homoiousion (of like substance). This was not so much a corruption of Scripture since the word Homoousion is not in the Bible, but I'm referring to this case for the sake of comparison to the Protestant versions that add one or more letters to authoritative text in order to promote their heresies.
Another Protestant corruption is the addition of the word "alone" as in "saved by faith" changed to say, saved by faith alone, which is one of Luther's many heresies. I'm not saying this is a literal corruption of the Bible for they didn't print Bibles with this change in it, as far as I know. The reason for that is, they may well have found that there are simply too many references to this principle in the New Testament alone:
Ephesians ii. 8
I Timothy ii. 15
St. Luke vii. 50
Hebrews x. 39
II Timothy iii. 15
St. Luke xviii. 42
I Corinthians xv. 2
St. Matthew ix. 22
St. Mark xvi. 16
Romans x. 10
II Thessalonians ii. 13
St. Mark x. 52
St. Mark v. 34
St. Luke xvii. 19
St. Luke viii. 48
In other words, to make it consistent, they would have had to corrupt 15 different passages of Holy Writ, each of which is a slightly different grammatical structure and context, so as to make this not a simple thing of adding one word in the same place each time. (Compare this to the first example above, regarding the addition of the letter "a" to make "...the Word was a God.")
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