The seventh seal – the sounding of the sixth trumpet releases plagues that kill one third of mankind (Revelation 9:13-9:21)
After the first woe passed, the sixth angel sounded his trumpet. John heard a voice emanate from the horns of the golden altar. The voice said to the sixth angel, “Release the four angels who are bound at the great river Euphrates.” And four angels who had been kept ready for this very hour were released to