Remember, O LORD, the children of Edom in the day of Jerusalem; who said, Rase it, rase it, even to the foundation thereof. Remember - the children of Edom - It appears from Jeremiah 12:6; Jeremiah 25:14; Lamentations 4:21, Lamentations 4:22; Ezekiel 25:12; Obadiah 1:11-14; that the Idumeans joined the army of Nebuchadnezzar against their brethren the Jews; and that they were main instruments in rasing the walls of Jerusalem even to the ground.
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.