Rev 22:18 I testify unto every man that heareth the words of the prophecy of this book, if any man shall add unto them, God shall add unto him the plagues which are written in this book:
Rev 22:19 and if any man shall take away from the words of the book of this prophecy, God shall take away his part from the tree of life, and out of the holy city, which are written in this book.
Jesus said this and He was not just talking about Revelation.If we study the Numeric pattern (mathematical pattern) in the whole Bible we see why He said this. If you change anything, even one letter in the original Hebrew or Greek, you destroy the pattern. Jesus was saying that every letter in where it is suppose to be, and we are not not change it. People have changed it when they translated. In some instances they added plurals , where the Bible had a singular.
Here is an example:
This is how it is translated:
Rev 11:8 And their dead bodies lie in the street of the great city, which spiritually is called Sodom and Egypt, where also their Lord was crucified.
Rev 11:9 And from among the peoples and tribes and tongues and nations do men look upon their dead bodies three days and a half, and suffer not their dead bodies to be laid in a tomb.
Here is how it should read. Notice that it does not make sense in a way , because how can many people have a dead "body" . Surely it must be "bodies" as they translated it?
Rev 11:8 And their dead body lie in the street of the great city, which spiritually is called Sodom and Egypt, where also their Lord was crucified.
Rev 11:9 And from among the peoples and tribes and tongues and nations do men look upon their dead body three days and a half, and suffer not their dead bodies (plural correct)to be laid in a tomb.
God is speaking about a "body" here in the same way He speaks of the "body" of Christ as a singular "body". Its a group, not just two people as we are taught. The "BODY" of witnesses are killed and that "BODY" is lying in the street of the great city.(Not a real city, but in this case the great city means the whole world outside Christ ) . Then the suffer not their bodies (corpses) to the laid in a tomb.
The translators, because they did not trust the original to be the absolute true Word of God, "corrected" it and because of that correction, you and I missed that , that scripture speaks of the BODY of believers that will be killed.