Revelation 9:13-15

New Revised Standard Version, Anglicised Catholic Edition

¹³ Then the sixth angel blew his trumpet, and I heard a voice from the four^[a] horns of the golden altar before God, ¹⁴ saying to the sixth angel who had the trumpet, ‘Release the four angels who are bound at the great river Euphrates.’ ¹⁵ So the four angels were released, who had been held ready for the hour, the day, the month, and the year, to kill a third of humankind.