Revelations 1:1 (ESV translation) The revelation of Jesus Christ, which God gave him to show to his servants the things that must soon take place. He made it known by sending his angel to his servant John,
Revelations 3:11 (ESV) I am coming soon. Hold fast what you have, so that no one may seize your crown.
Revelations 22 says it a lot. (They seemed pretty certain lol)
Revelations 22:6 (GW translation) “These words are trustworthy and true. The Lord God of the spirits of the prophets has sent his angel to show his servants the things that must happen soon. 22:7 I’m coming soon! Blessed is the one who follows the words of the prophecy in this book.”
Revelations 22:12 (GW) “Behold, I am coming soon, bringing my recompense with me, to repay each one for what he has done."
Revelations 22:20 (GW) He who testifies to these things says, “Surely I am coming soon.” Amen. Come, Lord Jesus!
On another note, Scientologists think that Ron Hubbard is coming back too. They leave out his slippers and cigarettes for when he returns.
I used to be one of them, and it scares me to realize that I could still be trapped in that belief system.