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Idumea means Edom, as in Ezekiel 35:15 (see the note there). For “cast it out” in the last clause of the verse, read empty it …

Therefore thus says the Lord God
Because these Heathens have acted such an unkind and cruel part to Israel: …

Those who put contempt and reproach on God's people will have it turned back on themselves. God promises favour to his Israel. We have no reason to…
Charles Ellicott
CharlesEllicott