Deuteronomy 4:2

Now it happened, in the fortieth year, on the first day of the eleventh month, Moses spoke to the children of Israel, according to all that Yahweh had commanded him to give to them,

“So you shall keep His statutes and His commandments which I am commanding you today, that it may go well with you and with your children after you, and that you may prolong your days on the land which Yahweh your God is giving you for all the days.”

“Whatever I am commanding you, you shall be careful to do; you shall not add to nor take away from it.

“Moses commanded us with a law, A possession for the assembly of Jacob.

That they should set their confidence in God And not forget the deeds of God, But observe His commandments,

Do not add to His words Lest He reprove you, and you be proved a liar.

The end of the matter, all that has been heard: fear God and keep His commandments, because this is the end of the matter for all mankind.

“Thus says Yahweh, ‘Stand in the court of the house of Yahweh, and you shall speak to all the cities of Judah who have come to worship in the house of Yahweh all the words that I have commanded you to speak to them. Do not take away a word!

I bear witness to everyone who hears the words of the prophecy of this book: If anyone adds to them, God will add to him the plagues which are written in this book.

And if anyone takes away from the words of the book of this prophecy, God will take away his part from the tree of life and from the holy city, which are written in this book.