Psalms 55:9

Destroy--literally, "swallow" (Ps 21:9). divide their tongues--or, "confound their speech," and hence their counsels (Ge 11:7). the city--perhaps Jerusalem, the scene of anarchy. 10, 11. which is described in detail (compare Ps 7:14-16).

Destroy, O Lord. Put mine enemies to the rout. Let them be devoured by the sword, since they have unsheathed it against me. How could we expect the exiled monarch to offer any other prayer than this against the rebellious bands of Absalom, and the crafty devices of Ahithophel? Divide their tongues. Make another Babel in their debates and councils of war. Set them at cross purposes. Divide the pack that the hunted one may escape. The divisions of error are the hope of truth. For I have seen violence and strife in the city. The rabble and their leaders were plotting and planning, raging and contending against their king, running wild with a thousand mad projects: anarchy had fermented among them, and the king hoped that now it might come to pass that the very lawlessness which had exiled him would create weakness among his foes. Revolution devours its own children. They who are strong through violence, will sooner or later find that their strength is their death. Absalom and Ahithophel may raise the mob, but they cannot so easily rule it, nor so readily settle their own policy as to remain firm friends. The prayer of David was heard, the rebels were soon divided in their councils; Ahithophel went his way to be hanged with a rope, and Absalom to be hanged without one.

Destroy, O lord - Swallow them up - confound them. Divide their tongues - Let his counsellors give opposite advice. Let them never agree, and let their devices be confounded. And the prayer was heard. Hushai and Ahithophel gave opposite counsel. Absalom followed that of Hushai; and Ahithophel, knowing that the steps advised by Hushai would bring Absalom’s affairs to ruin, went and hanged himself. See 2 Samuel 15, 16, and 17. Violence and strife in the city - They have been concerting violent measures; and thus are full of contention.

Destroy, O Lord - The word rendered “destroy,” properly means to “swallow up;” to “devour” with the idea of greediness. Isa 28:4; Exo 7:12; Jon 1:17; Jer 51:34. Then it is used in the sense of “destroy,” Job 20:18; Pro 1:12. The reference here is to the persons who had conspired against David. It is a prayer that they, and their counsels, might be destroyed: such a prayer as people always offer who pray for victory in battle. It is a prayer that the may be successful in what they regard as a righteous cause; but this implies a prayer that their enemies may be defeated and overcome. That is, they pray for success in what they have undertaken; and if it is right for them to attempt to do the thing, it is not wrong to pray that they may be succesful. And divide their tongues - There is evident allusion here to the confusion of tongues at Babel Gen 11:1-9; and as the language of those who undertook to build that tower was confounded so that they could not understand each other, so the psalmist prays that the counsels of those engaged against him might be confounded, or that they might be divided and distracted in their plans, so that they could not act in harmony. It is very probable that there is an allusion here to the prayer which David offered when he learned that Ahithophel was among the conspirators 2Sa 15:31; “And David said, O Lord, I pray thee, turn the counsel of Ahithophel into foolishness.” This would tend to divide and distract; the purposes of Absalom, and secure his defeat. For I have seen violence and strife in the city - In Jerusalem. Perhaps he had learned that among the conspirators there was not entire harmony, but that there were elements of “strife” and discord which led him to hope that their counsels would be confounded. […]