Psalms 86:2 - Joseph Benson’s Commentary on the Old and New Testaments

Preserve my soul, for I am holy Sanctified in some measure by thy grace, and sincerely devoted to thy service. Hebrew, אני חסיד, ani chasid, I am good, merciful, or pious. Show that mercy to me which I am willing and ready to show to others. This David mentions, not in a way of vain ostentation, but as an argument to move God to answer his prayers, because he was one of that sort of men whose prayers God had engaged himself, by his promise and covenant, to hear; and partly by way of just and necessary vindication of himself from the censures of his enemies, who represented him to the world as a dissembler, and secretly a very wicked man; concerning which he here makes a solemn appeal to God, desiring audience and help from him upon no other condition than that he was truly upright and righteous before him. Which, by the way, manifests no more arrogance than when he elsewhere professes his great love to, and longing after, God; his sincere obedience to all God's commands, and his hatred of every false way, and the like.