Revelation 9:15

And the four angels, who had been prepared for the hour and day and month and year, were released, so that they would kill a third of mankind.

Revelation 8:7

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.

Revelation 9:18

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

Revelation 8:9

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

Revelation 8:11-12

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.

Revelation 9:5

And they were not permitted to kill anyone, but to torment for five months; and their torment was like the torment of a scorpion when it stings a man.

Revelation 9:10

They have tails like scorpions, and stings; and in their tails is their power to hurt men 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
And they were not permitted to kill anyone, but to torment for five months; and their torment was like the torment 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 the brimstone which proceeded out of their mouths.
Revelation 8:7
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.