Commentaries:
Jamieson, Fausset, and Brown
Literally, "As to the enemy finished are his ruins for ever. Thou [God] hast destroyed," etc. (I Samuel 15:3, I Samuel 15:7; I Samuel 27:8-9). The wicked are utterly undone. Their ruins shall never be repaired.
Other Jamieson, Fausset, and Brown entries containing Psalms 9:6:
Psalms 10:15
Psalms 82:5
Isaiah 9:7
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