Revelation 9:15

And the four angels who had been kept in readiness for that hour, day, month, and year, were set at liberty, so that they might kill a third part of mankind.

Revelation 8:7

The first blew his trumpet; and there came hail and fire, mixed with blood, falling upon the earth; and a third part of the earth was burnt up, and a third part of the trees and all the green grass.

Revelation 9:18

By these three plagues a third part of mankind were destroyed--by the fire and the smoke, and by the sulphur which came from their mouths.

Revelation 8:9

And a third part of the creatures that were in the sea--those that had life--died; and a third part of the ships were destroyed.

Revelation 8:11-12

The name of the star is 'Wormwood;' and a third part of the waters were turned into wormwood, and vast numbers of the people died from drinking the water, because it had become bitter.

Revelation 9:5

Their mission was not to kill, but to cause awful agony for five months; and this agony was like that which a scorpion inflicts when it stings a man.

Revelation 9:10

They had tails like those of scorpions, and also stings; and in their tails lay their power of injuring mankind for five months.

Treasury of Scripture Knowledge

Summary

And the four angels were loosed, which were prepared for an hour, and a day, and a month, and a year, for to slay the third part of men.

An hour

Bible References

An hour

Revelation 9:5
Their mission was not to kill, but to cause awful agony for five months; and this agony was like that which a scorpion inflicts when it stings a man.

For to

Revelation 9:18
By these three plagues a third part of mankind were destroyed--by the fire and the smoke, and by the sulphur which came from their mouths.
Revelation 8:7
The first blew his trumpet; and there came hail and fire, mixed with blood, falling upon the earth; and a third part of the earth was burnt up, and a third part of the trees and all the green grass.