Revelation 22:9, 18
Revelation 22:9 NASB1995
But he *said to me, “Do not do that. I am a fellow servant of yours and of your brethren the prophets and of those who heed the words of this book. Worship God.”
Revelation 22:18 NASB1995
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 which are written in this book