Revelation 22:18–19
18 I warn everyone who hears the words of the prophecy of this book: pif anyone adds to them, God will add to him the plagues described in this book, 19 and if anyone takes away from the words of the book of this prophecy, God will take away his share in qthe tree of life and in rthe holy city, which are described in this book.
Deuteronomy 4:2
2 yYou shall not add to the word that I command you, nor take from it, that you may keep the commandments of the Lord your God that I command you.
Proverbs 30:5–6
5 tEvery word of God proves true;
he is ua shield to those who take refuge in him.
6 vDo not add to his words,
lest he rebuke you and you be found a liar.