4. He greatly rejoices and praises God, in a full confidence that God would appear for his deliverance, v. 13. So full is he of the comfort of God's presence with him, the divine protection he is under, and the divine promise he has to depend upon, that in a transport of joy he stirs up himself and others to give God the glory of it: Sing unto the Lord, praise you the Lord. Here appears a great change with him since he began this discourse; the clouds are blown over, his complaints all silenced and turned into thanksgivings. He has now an entire confidence in that God whom (v. 7) he was distrusting; he stirs up himself to praise that name which (v. 9) he was resolving no more to make mention of. It was the lively exercise of faith that made this happy change, that turned his sighs into songs and his tremblings into triumphs. It is proper to express our hope in God by our praising him, and our praising God by our singing to him. That which is the matter of the praise is, He hath delivered the soul of the poor from the hand of the evil-doers; he means especially himself, his own poor soul. "He hath delivered me formerly when I was in distress, and now of late out of the hand of Pashur, and he will continue to deliver me, 2 Cor. i. 10. He will deliver my soul from the sin that I am in danger of falling into when I am thus persecuted. He hath delivered me from the hand of evil-doers, so that they have not gained their point, nor had their will." Note, Those that are faithful in well-doing need not fear those that are spiteful in evil-doing, for they have a God to trust to who has well-doers under the hand of his protection and evil-doers under the hand of his restraint.