18 And I witness to each man hearing the words of prophecy of this book, if any man shall put to these things, God shall put on him the vengeances [or the plagues] written in this book.

19 And if any man [shall] do away of the words of the book of this prophecy, God shall take away the part of him from the book of life, and from the holy city, and from these things that be written in this book.