http://etext.lib.virginia.edu/etcbin/toccer-new2?id=RsvReve.sgm&images=images/modeng&data=/texts/english/modeng/parsed&tag=public&part=22&division=div1
17: The Spirit and the Bride say, "Come." And let him who hears say, "Come." And let him who is
thirsty come, let him who desires take the water of life without price.
18: I warn every one who hears the words of the prophecy of this book: if any one adds to them, God
will add to him the plagues described in this book,
19: and if any one takes away from the words of the book of this prophecy, God will take away his share
in the tree of life and in the holy city, which are described in this book.
20: He who testifies to these things says, "Surely I am coming soon." Amen. Come, Lord Jesus!
21: The grace of the Lord Jesus be with the saints. Amen.