So out of context that it is repeated in Revelation 22:18 For I testify unto every man that heareth the words of the prophecy of this book, IF any man shall add unto these things, God shall add unto him the plagues that are written in this book:
19 And if any man shall take away from the words of the book of this prophecy, God shall take away his part out of the book of life, and out of the holy city, and from the things which are written in this book?
Just so the 'context' is NOT lost: verse 16 "I Jesus have sent Mine angel to testify unto you these things in the (get this) churches. I am the Root, and the Offspring of David, and the bright and morning Star."
Thank you so much for sharing that passage, dear brother in Christ!