Parallel
Revelation 9:15
CNTR Statistical Restoration · Berean Standard Bible
Καὶ ἐλύθησαν οἱ τέσσαρες ἄγγελοι, οἱ ἡτοιμασμένοι εἰς τὴν ὥραν, καὶ ἡμέραν, καὶ μῆνα, καὶ ἐνιαυτόν, ἵνα ἀποκτείνωσιν τὸ τρίτον τῶν ἀνθρώπων.
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.