Voice of wings
'The voice of wings,' as in Revelation 9:9, signifies rationalizations, because 'to fly' signifies perceiving and instructing.
(Референце: Apocalypse Revealed 437)
Revelation 9:9
9
They had breastplates, like breastplates of iron. The sound of their wings was like the sound of chariots, or of many horses rushing to war.