David praises God for his goodness to himself and others, ver. 1-7. Encourages the righteous to trust in him, ver. 8-10. Exhorts them to fear God and depart from evil, ver. 11-14. God's favour to the righteous and displeasure at the wicked, ver. 15-22 A psalm of David, when he changed his behaviour before Abimelech: who drove him away, and he departed. Title of the psalm. When - A psalm made upon that occasion, though not at that time, when he counterfeited madness. Wherein whether he sinned or not, is matter of dispute; but this is undoubted, that his deliverance deserved this solemn acknowledgment. Abimelech - Called Achish, 1 Sam. xxi, 10. But Abimelech seems to have been the common name of the kings of the Philistines, Gen. xx, 2; xxvi, 1, as Pharaoh was of the Egyptians.