Revelation 9:15

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.

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.

And the four angels were loosed, that had been prepared for the hour and day and month and year, that they should kill the third part of men.

and loosed were the four messengers, who have been made ready for the hour, and day, and month, and year, that they may kill the third of men;

So the four angels who had been prepared for this hour and day and month and year were released to kill a third of mankind.