Revelation 9:15

And the four angels, who had been held ready for the hour and day and month and year, were released to kill a third of mankind.

Revelation 8:7

The first angel sounded his trumpet, 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.

Revelation 9:18

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

Revelation 8:9

and a third of the living creatures in the sea died; and a third of the ships were destroyed.

Revelation 8:11-12

The name of the star is Wormwood. A third of the waters became Wormwood, and many men died from the waters, because they were made bitter.

Revelation 9:5

They were allowed to torture them for five months, but not to kill them, and their torture was like the torture of a scorpion, when it stings a man.

Revelation 9:10

They have tails like scorpions, and stings, and their power to hurt men for five months lies in their tails.

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
They were allowed to torture them for five months, but not to kill them, and their torture was like the torture of a scorpion, when it stings a man.

For to

Revelation 9:18
A third of mankind was killed by these three plagues, by the fire and the smoke and sulfur that came out of their mouths.
Revelation 8:7
The first angel sounded his trumpet, 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.