Revelation 9:15 in the King James Version
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.
Context
14 saying to the sixth angel who had the trumpet, “Free the four angels who are bound at the great river Euphrates!”
15 The four angels were freed who had been prepared for that hour and day and month and year, so that they might kill one third of mankind.
16 The number of the armies of the horsemen was two hundred million. I heard the number of them.