Revelation 9:13 in the King James Version
And the sixth angel sounded, and I heard a voice from the four horns of the golden altar which is before God,
Context
12 The first woe is past. Behold, there are still two woes coming after this.
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!”