Deuteronomy 4:2

2 aYou 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.

Deuteronomy 12:32

32
Ch 13:1 in Hebrew
Everything that I command you, you shall be careful to do. cYou shall not add to it or take from it.

Deuteronomy 13:1-11

1If a prophet or da dreamer of dreams arises among you and gives you a sign or a wonder, 2and ethe sign or wonder that he tells you comes to pass, and if he says, ‘Let us go after other gods,’ which you have not known, ‘and let us serve them,’ 3you shall not listen to the words of that prophet or that dreamer of dreams. For the Lord your God fis testing you, to know whether you love the Lord your God with all your heart and with all your soul. 4You shall gwalk after the Lord your God and fear him and keep his commandments and obey his voice, and you shall serve him and hhold fast to him. 5But ithat prophet or that dreamer of dreams shall be put to death, because he has taught rebellion against the Lord your God, who brought you out of the land of Egypt and redeemed you out of the house of slavery, to make you leave the way in which the Lord your God commanded you to walk. jSo you shall purge the evil
Or  evil person
from your midst.

6 lIf your brother, the son of your mother, or your son or your daughter or mthe wife you embrace
Hebrew  the wife of your bosom
or your friend owho is as your own soul entices you secretly, saying, ‘Let us go and serve other gods,’ pwhich neither you nor your fathers have known,
7some qof the gods of the peoples who are around you, whether near you or far off from you, from the one end of the earth to the other, 8you shall rnot yield to him or listen to him, nor sshall your eye pity him, nor shall you spare him, nor shall you conceal him. 9But you shall kill him. tYour hand shall be first against him to put him to death, and afterward the hand of all the people. 10 uYou shall stone him to death with stones, because he sought to draw you away from the Lord your God, who brought you out of the land of Egypt, out of the house of slavery. 11And vall Israel shall hear and fear and never again do any such wickedness as this among you.

Proverbs 30:6

6 wDo not add to his words,
lest he rebuke you and you be found a liar.

Revelation of John 22:18-19

18I warn everyone who hears the words of the prophecy of this book: xif anyone adds to them, God will add to him the plagues described in this book, 19and if anyone takes away from the words of the book of this prophecy, God will take away his share in ythe tree of life and in zthe holy city, which are described in this book.

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