Revelation 9:15-16

 "And behold, I am coming quickly. 

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

Revelation 22:7  NASB

And the four angels who had been kept ready for this very hour and day and month and year were released to kill a third of mankind. The number of the mounted troops was twice ten thousand times ten thousand. I heard their number. 

And the four angels who had been kept ready for this very hour and day and month and year were released 
Revelation 20:7-8  When the thousand years are over, Satan will be released from his prison and will go out to deceive the nations in the four corners of the earth--Gog and Magog--and to gather them for battle. In number they are like the sand on the seashore.

to kill a third 
Revelation 8:7  The first angel sounded his trumpet, and there came hail and fire mixed with blood, and it was hurled down on the earth. A third of the earth was burned up, a third of the trees were burned up, and all the green grass was burned up.

of mankind 
Revelation 9:18  A third of mankind was killed by the three plagues of fire, smoke and sulfur that came out of their (the horses') mouths.

The number of the mounted troops was twice ten thousand times ten thousand. I heard their number 
Revelation 5:11  Then I looked and heard the voice of many angels, numbering thousands upon thousands, and ten thousand times ten thousand. They encircled the throne and the living creatures and the elders.
Revelation 7:4  Then I heard the number of those who were sealed: 144,000 from all the tribes of Israel.
Psalm 68:17  The chariots of God are tens of thousands and thousands of thousands; the Lord has come from Sinai into his sanctuary.
Daniel 7:9-10  "As I looked, thrones were set in place, and the Ancient of Days took his seat. His clothing was white as snow; the hair of his head was white like wool. His throne was flaming with fire, and its wheels were all ablaze. A river of fire was flowing, coming out  from before him. Thousands upon thousands attended him; ten thousand times ten thousand stood before him. The court was seated, and the books were opened.

(parentheses 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. 
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