Revelation 9:13-15

World English Bible

¹³ The sixth angel sounded. I heard a voice from the horns of the golden altar which is before God, 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.