John Gill's Exposition of the Whole Bible
Psalms 35:4
Let them be confounded, and put to shame, that seek after my soul,.... This petition, and what follows, which seem to be by way of imprecation, are to be considered as prophecies of what would be, and as expressions of faith that so it should be; and are not to be drawn into examples, and to be imitated by private persons; nor are they contrary to those evangelical rules, which require men to love their enemies, and pray for them; to give place to wrath, and not meditate vengeance, nor take it: and so it was with David's enemies. Saul, who hunted after his soul or life, to take it away, was filled with shame and confusion, when David, having cut off the skirt of his garment, held it up to him; by which he was convinced that his life was in his hands, and he did not take it away, though he was seeking after his: and so it will fare with the enemies of Christ, the Jews; who sought to take away his life and did take it away, when they shall see him come in the clouds of heaven, whom they have pierced; and in like manner will it be with the enemies of all his people, whom nothing will content but their lives, when they shall see the lambs they have worried and butchered on Christ's right hand, and they on the left; and to the sheep said, Come, ye blessed; and to them, Go, ye cursed,
let them be turned back and brought to confusion that devise my hurt; as Saul did David's, even when he made the most specious show of affection and respect unto him, as well as when he more openly persecuted him; and more than once was he turned back with shame, and departed home; see 1 Samuel 24:22. The Jews, that came to apprehend Christ, together with the Roman soldiers, and who had devised and intended his hurt, went backward, and fell to the ground with shame and confusion, when, having asked them who they sought, and they had replied, told them he was the person; and how often has it been, that when wicked men have devised, deceitful matters against the members of Christ, that their counsel has been carried headlong, they have not been able to perform their enterprises; a hook has been put into their nose, and a bridle in their jaws, and they have been turned back the way they came, with shame and disgrace.