Remember, O Lord, the children of Edom— "Who instead of pitying Jerusalem, as became neighbours and relations, were glad to see the day of its desolations." The time when God's judgments are executed, is frequently called, emphatically, the day. See Obadiah 1:12-13; Obadiah 1:15 and Psalms 37:13. The Edomites, who thus rejoiced at the desolations of Jerusalem, were the descendants of Esau. See Ezekiel 25:12. And for this their malicious joy, God's judgments came upon them. See Jeremiah 49:7; Jeremiah 49:39.
Related Commentaries of Psalms 137:7
Psalms 137:7
7 Remember, O LORD, the children of Edom in the day of Jerusalem; who said, Rase it, rase it, even to the foundation thereof.