Adam Clarke's Commentary on the Bible - Revelation 9:4
They should not hurt the grass - Neither the common people, the men of middling condition, nor the nobles. However, this appears rather to refer to the prudent counsels of a military chief, not to destroy the crops and herbage of which they might have need in their campaigns. Which have not the seal of God - All false, hypocritical, and heterodox Christians. read more
Adam Clarke's Commentary on the Bible - Revelation 9:3
Locusts - Vast hordes of military troops: the description which follows certainly agrees better with the Saracens than with any other people or nation, but may also apply to the Romans. As the scorpions of the earth have power - Namely, to hurt men by stinging them. Scorpions may signify archers; and hence the description has been applied to Cestius Gallus, the Roman general, who had many archers in his army. read more