"For behold, I am approaching quickly! Blessed is he who keeps the words of the prophecy of this book.
Other versions
King James Version
Behold, I come quickly: blessed is he that keepeth the sayings of the prophecy of this book.English Standard Version
"And behold, I am coming soon. Blessed is the one who keeps the words of the prophecy of this book."New International Version
"Behold, I am coming soon! Blessed is he who keeps the words of the prophecy in this book."