Commentaries:
Adam Clarke
They had breastplates - of iron - They seemed to be invulnerable, for no force availed against them.
The sound of their wings - Their hanging weapons and military trappings, with the clang of their shields and swords when they make their fierce onsets. This simile is borrowed from Joel 2:5-7.
Other Adam Clarke entries containing Revelation 9:9:
Revelation 11:14
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