Revelation 9:15

And the four angels were released. They were prepared for this very hour, and day, and month, and year, to kill a third of mankind.

Revelation 8:7

The first angel blew his trumpet. Hail and fire mixed with blood came down upon the earth. A third of the trees were burned up, and all green grass was burned up.

Revelation 9:18

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

Revelation 8:9

A third of the living creatures in the sea died. And a third of the ships were destroyed.

Revelation 8:11-12

The star is called Wormwood (Calamity) (Bitterness): and a third of the waters became wormwood; and many men died from the waters, because they were made bitter.

Revelation 9:5

The locusts were not to kill them, but should torment them for five months: and their torment was the torment of a scorpion, when it strikes a man.

Revelation 9:10

Their tails were like scorpions' tails, for there were stings in their tails. They had 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
The locusts were not to kill them, but should torment them for five months: and their torment was the torment of a scorpion, when it strikes a man.

For to

Revelation 9:18
A third of mankind was killed by these plagues of fire and smoke and sulfur that came out of their mouths.
Revelation 8:7
The first angel blew his trumpet. Hail and fire mixed with blood came down upon the earth. A third of the trees were burned up, and all green grass was burned up.