Revelation 22:9, 18
Revelation 22:9 ESV
but he said to me, “You must not do that! I am a fellow servant with you and your brothers the prophets, and with those who keep the words of this book. Worship God.”
Revelation 22:18 ESV
I warn everyone who hears the words of the prophecy of this book: if anyone adds to them, God will add to him the plagues described in this book