Deuteronomy 12:32
All of the things that I [am] commanding you, {you must diligently observe}; you shall not add to it, and you shall not take away from it."
Deuteronomy 4:2
You must not add to the word that I [am] commanding you, and you shall not take away from it [in order] to keep the commands of Yahweh your God that I [am] commanding you [to observe].
Joshua 1:7
Only be strong and very courageous {to observe diligently the whole law} that Moses my servant commanded you. Do not turn aside from it, [to] the right or left, so that you may succeed {wherever you go}.
Proverbs 30:6
Do not add to his words lest he rebuke you and you be found a liar.
Revelation 22:18-19
I testify to everyone who hears the words of the prophecy of this book: if anyone adds to them, God will add to him the plagues written in this book.
Deuteronomy 13:18
if you listen to the voice of Yahweh your God, to keep all [of] his commandments that I [am] commanding [to] you {today} [so as] to do the right [thing] in the eyes of Yahweh your God."
Matthew 28:20
teaching them to observe everything I have commanded you, and behold, I am with you all the days until the end of the age."