Psalms 55:9-11

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.