Revelation 9:10-11

 "And behold, I am coming quickly. 

Blessed is he who heeds the words of the prophecy of this book."     

Revelation 22:7  NASB

They had tails with stingers, like scorpions, and in their tails they had power to torment people for five months. They had as king over them the angel of the Abyss, whose name in Hebrew is Abaddon and in Greek is Apollyon (that is Destroyer). 

in their tails they had power to torment people for five months 
Revelation 9:3  And out of the smoke locusts came down on the earth and were given power like that of scorpions of the earth.
Revelation 9:5  They were not allowed to kill them but only to torture them for five months. And the agony they suffered was like that of the sting of a scorpion when it strikes.
Revelation 9:19  The power of the horses was in their mouths and in their tails; for their tails were like snakes, having heads with which they inflict injury.

They had as king over them the angel of the Abyss 
Revelation 9:1-2  The fifth angel sounded his trumpet, and I saw a star that had fallen from the sky to the earth. The star was given the key to the shaft of the Abyss. When he opened the Abyss, smoke rose from it like the smoke from a giant furnace. The sun and sky were darkened by the smoke from the Abyss.
Luke 8:31  And they begged Jesus repeatedly not to order them to go into the Abyss.

whose name in Hebrew 
Revelation 16:16  Then they gathered the kings together to the place that in Hebrew is called Armageddon.

is Abaddon and in Greek is Apollyon (that is Destroyer) 
Job 26:6  "The realm of the dead is naked before God; Destruction lies uncovered."
Job 28:22  Destruction and Death say, "Only a rumor of it [wisdom and understanding] has reached our ears."
Psalm 88:10-12  Do you show your wonders to the dead? Do their spirits rise up and praise your faithfulness in Destruction? Are your wonders known in the place of darkness, or your righteous deeds in the land of oblivion?
Proverbs 15:11  Death and Destruction lie open before the LORD--how much more do human hearts!

[brackets are mine]

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984, 2011 by Biblica, Inc.® Used by permission. All rights reserved worldwide. 
Limited to 15 verses per post.