Deuteronomy 4:2
You shall not add to the word which I am commanding you, nor take away from it, that you may keep the commandments of the LORD your God which I command you.
Proverbs 30:6
Do not add to His words Or He will reprove you, and you will be proved a liar.
Revelation 22:18
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: