Revelation 9:15

And the four angels who had been ready for this hour and day and month and year were [now] released to kill one third of mankind.

Revelation 8:7

[When] the first trumpet sounded [I saw] hail and fire, mingled with blood, being hurled down onto the earth. And one third of it was burned up, and one third of the trees were burned up and all the green grass was [also] burned up.

Revelation 9:18

One third of mankind was killed by these three plagues --- the fire, the smoke and the sulphur, which proceeded out of the horses' mouths.

Revelation 8:9

and one third of [all] living sea creatures died, and one third of [all] ships were destroyed.

Revelation 8:11-12

And the star was called "Wormwood" [Note: The Greek word here means "bitter," See Lam. 3:15 ASV], and one third of the waters became wormwood [i.e., bitter], and many people died from the waters because they had become bitter.

Revelation 9:5

And the locusts were not given the power to kill these people, but [only] to torture them for five months. And the torment they would inflict was like a scorpion stinging a person.

Revelation 9:10

And they had tails like scorpions with stingers, and in their tails they had the power to inflict harm upon people 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 the locusts were not given the power to kill these people, but [only] to torture them for five months. And the torment they would inflict was like a scorpion stinging a person.

For to

Revelation 9:18
One third of mankind was killed by these three plagues --- the fire, the smoke and the sulphur, which proceeded out of the horses' mouths.
Revelation 8:7
[When] the first trumpet sounded [I saw] hail and fire, mingled with blood, being hurled down onto the earth. And one third of it was burned up, and one third of the trees were burned up and all the green grass was [also] burned up.