Revelation 14:17-20

 "And behold, I am coming quickly. 

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

Revelation 22:7  NASB

Another angel came out of the temple in heaven, and he too had a sharp sickle. Still another angel, who had charge of the fire, came from the altar and called in a loud voice to him who had the sharp sickle, "Take your sharp sickle and gather the clusters of grapes from the earth's vine, because the grapes are ripe." The angel swung his sickle on the earth, gathered its grapes and threw them into the great winepress of God's wrath. They were trampled in the winepress outside the city, and blood flowed out of the press, rising as high as the horses' bridles for a distance of 1,600 stadia. (about 180 miles or 300 kilometers) 

Another angel came out of the temple in heaven, and he too had a sharp sickle 
Revelation 14:15  Then another angel came out of the temple and called in a loud voice to him who was sitting on the cloud, "Take your sickle and reap, because the time to reap has come, for the harvest of the earth is ripe." 

Still another angel, who had charge of the fire, came from the altar and called in a loud voice to him who had the sharp sickle
Revelation 6:9  When he opened the fifth seal, I saw under the altar the souls of those who had been slain because of the word of God and the testimony they had maintained.
Revelation 8:5  Then the angel took the censer, filled it with fire from the altar, and hurled it on the earth; and there came peals of thunder, rumblings, flashes of lightning and an earthquake.
Revelation 16:7  And I heard the altar respond: "Yes, Lord God Almighty, true and just are your judgments."

Take your sharp sickle and gather the clusters of grapes from the earth's vine, because the grapes are ripe
(see Revelation 14:15 above)

The angel swung his sickle on the earth, gathered its grapes and threw them into the great winepress of God's wrath 
Revelation 19:15  Coming out of his mouth is a sharp sword with which to strike down the nations. "He will rule them with an iron scepter." (Psalm 2:9) He treads the winepress of the fury of the wrath of God Almighty.

They were trampled in the winepress 
Isaiah 63:3  "I have trodden the winepress alone; from the nations no one was with me. I trampled them in my anger  and trod them down in my wrath; their blood splattered my garments, and I stained all my clothing."
Joel 3:13  "Swing the sickle for the harvest is ripe. Come, trample the grapes, for the winepress is full and vats overflow--so great is their wickedness!"

outside the city 
Hebrews 13:12  And so Jesus also suffered outside the city gate to make the people holy through his own blood.
Revelation 11:8  Their bodies (the two witnesses) will lie in the public square of the great city--which is figuratively called Sodom and Egypt--where their Lord was crucified.

and blood flowed out of the press 
Genesis 49:11  "He (Judah) will tether his donkey to a vine, his colt to the choicest branch; he will wash his garments in wine, his robes in the blood of grapes."

(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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