You know that was how they copyrighted back then don't you? John did not want anyone to alter the vision he received so he included that as a curse to anyone that altered it.<quoted text>the bible states do not add or take anything out or i;ll take your part out of the book of life?let him who reads understand.
There was no Bible then so it only applied to the vision that was later named Revelation.
In fact, it was the first thing John wrote. His other books came later. When the Bible was canonized, they put the book of Revelation at the end because it was about the second coming.