Commentaries:
Jamieson, Fausset, and Brown
God will make Israel to destroy their enemies as the Eastern corn-drag (Isaiah 28:27-28) bruises out the grain with its teeth, and gives the chaff to the winds to scatter.
teeth--serrated, so as to cut up the straw for fodder and separate the grain from the chaff.
mountains . . . hills--kingdoms more or less powerful that were hostile to Israel (Isaiah 2:14).
Other commentary entries containing this verse:
Psalms 76:4
Micah 4:13
Revelation 17:9
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