Revelation 9:15

And the four angels were loosed, that had been prepared for the hour and day and month and year, that they should kill the third part of men.

Revelation 8:7

And the first sounded, and there followed hail and fire, mingled with blood, and they were cast upon the earth: and the third part of the earth was burnt up, and the third part of the trees was burnt up, and all green grass was burnt up.

Revelation 9:18

By these three plagues was the third part of men killed, by the fire and the smoke and the brimstone, which proceeded out of their mouths.

Revelation 8:9

and there died the third part of the creatures which were in the sea, even they that had life; and the third part of the ships was destroyed.

Revelation 8:11-12

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

Revelation 9:5

And it was given them that they should not kill them, but that they should be tormented five months: and their torment was as the torment of a scorpion, when it striketh a man.

Revelation 9:10

And they have tails like unto scorpions, and stings; and in their tails is their power to hurt men 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
And it was given them that they should not kill them, but that they should be tormented five months: and their torment was as the torment of a scorpion, when it striketh a man.

For to

Revelation 9:18
By these three plagues was the third part of men killed, by the fire and the smoke and the brimstone, which proceeded out of their mouths.
Revelation 8:7
And the first sounded, and there followed hail and fire, mingled with blood, and they were cast upon the earth: and the third part of the earth was burnt up, and the third part of the trees was burnt up, and all green grass was burnt up.

American Standard Version Public Domain