Deuteronomy 12:32
Whatever thing I command you, observe to do it: thou shalt not add to it, nor diminish from it.
Deuteronomy 4:2
Ye shall not add to the word which I command you, neither shall ye diminish aught from it, that ye may keep the commandments of the LORD your God which I command you.
Joshua 1:7
Only be thou strong and very courageous, that thou mayest observe to do according to all the law which Moses my servant commanded thee: turn not from it to the right hand or to the left, that thou mayest prosper whithersoever thou goest.
Proverbs 30:6
Add thou not to his words, lest he reprove thee, and thou be found a liar.
Revelation 22:18-19
For I testify to every man that heareth the words of the prophecy of this book, if any man shall add to these things, God will add to him the plagues that are written in this book:
Deuteronomy 13:18
When thou shalt hearken to the voice of the LORD thy God, to keep all his commandments which I command thee this day, to do that which is right in the eyes of the LORD thy God.
Matthew 28:20
Teaching them to observe all things whatever I have commanded you: and lo, I am with you always, even to the end of the world. Amen.