I John 4:1...Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.

Rev 1:3...Blessed is he that readeth, and they that hear the words of this prophecy, and keep those things which are written therein, for the time is at hand.

Rev 22:18-19...18 For I testify unto every man that heareth the words of the prophecy of this book, If any man shall add unto these things, God shall add unto him the plagues that are written in this book;
19 And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book.