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 יהוה your Elohim which I command you."

Deuteronomy 12:32 "Whatever I command you, you shall be careful to do; you shall not add to nor take away from it"

Proverbs 30:6 "Do not add to His words or He will reprove you, and you will be proved a liar"

Joshua 1:7 "Only be strong and very courageous; be careful to do according to all the law which Moses My servant commanded you; do not turn from it to the right or to the left, so that you may have success wherever you go. "