Revelation 9:13-21 - A Third Of Humanity Killed By Plagues
13 Then the sixth angel blew; and I heard a voice proceeding from the corners of the golden altar that stood before God. 14 It spoke to the sixth angel--the angel with the trumpet--and said 'Let loose the four angels that are in chains at the great river Euphrates.' 15 Then the four angels, that were held in readiness for that hour and day and month and year, were let loose, to destroy a third of mankind. 16 The number of the hosts of horsemen was ten thousand times ten thousand, twice told; I heard their number. 17 And this is what the horses and their riders appeared to be like in my vision:--They had breastplates of fire, blood-red and sulphurous, and the heads of the horses were like lions' heads, while out of their mouths issue fire, and smoke, and sulphur. 18 Through these three Curses a third of mankind perished--because of the fire, and the smoke, and the sulphur that issued from their mouths; 19 for the power of the horses lies in their mouths and in their tails. For their tails are like snakes, with heads, and it is with them that they do harm.
20 But those who were left of mankind, who had not perished through these Curses, did not repent and turn away from what their own hands had made; they would not abandon the worship of 'demons, and of idols made of gold or silver or brass or stone or wood, which can neither see, nor hear, nor walk'; 21 and they did not repent of their murders, or their sorceries, or their licentiousness, or their thefts.