Bible Verses About Prophecy: Adding to, or taking from

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:

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.