If we look at David in these verses, we see how the distressed monarch pleaded with God to prosper the plan he had laid with his friend Hushai, to defeat the counsel of his foes. He had sent back this man to be with his unnatural son for that purpose. And the prayer here used is followed with another in the history, to turn the counsel of Ahitophel, an enemy of his, but held in great reputation, into foolishness. 2 Samuel 15:31-34.
Related Commentaries of Psalms 55:9
Psalms 55:9-11
9 Destroy, O Lord, and divide their tongues: for I have seen violence and strife in the city.
10 Day and night they go about it upon the walls thereof: mischief also and sorrow are in the midst of it.
11 Wickedness is in the midst thereof: deceit and guile depart not from her streets.