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Because that Edom hath dealt - The Edomites were the most inveterate enemies of the Jews from the very earliest times, and ever did all that they could to annoy them.

Edom, so named from Esau, consisted of various tribes enumerated in 2 Kings 8:20. Under the name of Idumea the land was conquered by John Hyrcanus (compare Ezekiel 25:14), when many of the people adopted the religion of the Jews. In later times the Idumean Herod became king of Palestine, reckoning himself as a Jew. Mount Seir, deserted by its original inhabitants, was occupied by a tribe of Arabians (the Nabatheans), under whelm Petra rose and continued a flourishing city under Roman dominion, until the tide of Mahometan conquest brought it to that ruin in which Edom at last found the complete fulfillment of the prophecies uttered against it Ezekiel 35:1-15.

Taking vengeance - Referring to the wrong done by Jacob to Esau Genesis 27:36.

Though one event seem to the righteous and wicked, it is vastly different. Those who glory in any other defence and protection than the Divine power, providence, and promise, will, sooner or later, be ashamed of their glorying. Those who will not leave it to God to take vengeance for them, may expect that he will take vengeance on them. The equity of the Lord's judgments is to be observed, when he not only avenges injuries upon those that did them, but by those against whom they were done. Those who treasure up old hatred, and watch for the opportunity of manifesting it, are treasuring up for themselves wrath against the day of wrath.