Bible: Revelation 9:14, 15
9:14 saying to the sixth angel, the one holding 1 the trumpet, “Set free 2 the four angels who are bound at the great river Euphrates!” 9:15 Then 3 the four angels who had been prepared for this 4 hour, day, 5 month, and year were set free to kill 6 a third of humanity. NET Bible Study Environment
