Revelation 22FYI, "this book" is the book of "Revelation" that John was writing at the time, not the Bible as a whole.18I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in this book. 19And if anyone takes words away from this book of prophecy, God will take away from him his share in the tree of life and in the holy city, which are described in this book.
Moreover, John could not have been referring to the Bible as we know it today, since the New Testament did not yet exist. The canon of the New Testament would not be formally determined for another 300-350 years.
Obviously.