Deliver me from bloodguiltiness, O God, thou God of my salvation: and my tongue shall sing aloud of thy righteousness. Deliver me from blood-guiltiness - This is one of the expressions that gives most color to the propriety of the title affixed to this Psalm. Here he may have in view the death of Uriah, and consider that his blood cries for vengeance against him; and nothing but the mere mercy of God can wipe this blood from his conscience. The prayer here is earnest and energetic: O God! thou God of my salvation! deliver me! The Chaldee reads, "Deliver me (מדין קטול middin ketol) from the judgment of slaughter."
My tongue shall sing aloud - My tongue shall praise thy righteousness. I shall testify to all that thou hast the highest displeasure against sin, and wilt excuse it in no person; and that so merciful art thou, that if a sinner turn to thee with a deeply penitent and broken heart, thou wilt forgive his iniquities. None, from my case, can ever presume; none, from my case, need ever despair.