Adam Clarke on Psalms 89:22

The enemy shall not exact upon him - None of his enemies shall be able to prevail against him. It is worthy of remark that David was never overthrown; he finally conquered every foe that rose up against him. Saul's persecution, Absalom's revolt, Sheba's conspiracy, and the struggle made by the partisans of the house of Saul after his death, only tended to call forth David's skill, courage, and prowess, and to seat him more firmly on his throne. The Philistines, the Ammonites, the Syrians, etc., united all their forces to crush him, but in vain: "God beat down all his foes before his face," and variously plagued those who opposed him, Psa 89:23.