Revelation 9:15

And the first sounded, and there came hail and fire, mixed with blood, and they were thrown to the earth; and a third of the earth was burned up, and a third of the trees were burned up, and all the green grass was burned up.

And the second angel sounded, and something like a great mountain burning with fire was thrown into the sea; and a third of the sea became blood,

and a third of the creatures which were in the sea—those which had life—died; and a third of the ships were destroyed.

And the third angel sounded, and a great star fell from heaven, burning like a torch, and it fell on a third of the rivers and on the springs of waters.

And the name of the star is called Wormwood; and a third of the waters became wormwood, and many men died from the waters, because they were made bitter.

And the fourth angel sounded, and a third of the sun and a third of the moon and a third of the stars were struck, so that a third of them would be darkened and the day would not shine for a third of it, and the night in the same way.

A third of mankind was killed by these three plagues, by the fire and the smoke and the brimstone which came out of their mouths.