Revelation 9:15

Then the four angels that were kept in readiness for that hour and day and month and year were turned loose to kill one-third of mankind.

Revelation 8:7

The first one blew his trumpet, and there was a shower of hail and fire mixed with blood as it hurled itself upon the earth, and one-third of the earth was burned up, and all the green grass was burned up.

Revelation 9:18

One-third of mankind was killed by these three plagues: the fire, smoke, and sulphur that kept pouring out of their mouths.

Revelation 8:9

and one-third of all the living creatures in the sea perished, and one-third of the ships were destroyed.

Revelation 8:11-12

The star is called Absinthus, that is, Wormwood. So one-third of the waters turned to wormwood, and great numbers of people died of the waters, because they had turned bitter.

Revelation 9:5

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

Revelation 9:10

they had tails like scorpions with stings in them, so in their tails their power lay to injure 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
They were not permitted to kill them, but only to torture them for five months, and the torture they inflicted was like the torture of a scorpion when it stings a man.

For to

Revelation 9:18
One-third of mankind was killed by these three plagues: the fire, smoke, and sulphur that kept pouring out of their mouths.
Revelation 8:7
The first one blew his trumpet, and there was a shower of hail and fire mixed with blood as it hurled itself upon the earth, and one-third of the earth was burned up, and all the green grass was burned up.