Psalms 55:9 - Coke's Commentary on the Holy Bible

Destroy, O Lord, &c.— Confound, or overwhelm them, O Lord, and disunite their counsels. Chandler. Praying that God would destroy their consultations by dividing them, was the prayer of a wise man, and verified by the event; as the counsels of Achitophel and Hushai were divided, and thereby Achitophel's advice was utterly frustrated and destroyed. The 10th and 11th verses express in very strong terms the confusion and contention, the deceit and treachery, and other crimes, which abounded in the city by the managers and abetters of this conspiracy. They watched the walls; they resorted to violence and fraud to increase their numbers, and the emissaries of the rebels used every art to alienate the hearts of the people from their king, and engage them in the interests of his unnatural and impious son. Chandler. It plainly appears, says Dr. Delaney, from this Psalm, particularly from Psalms 55:9-15 that David had discerned the seeds and workings of a conspiracy in the city, and that Achitophel was at the bottom of it; and not only so, but that David foresaw his sudden and sad end.