Psalm 51:1-4 - A Prayer for Mercy

Have Mercy upon me O God, according to Thy Lovingkindness: according to the multitude of Thy tender Mercies, blot out my transgressions. 

Wash me thoroughly from mine iniquity, and cleanse me from my sin.  For I acknowldge my transgressions: and my sin is ever before me. 

Against Thee, Thee only, have I sinned, and done this evil in Thy sight: that Thou might be justified when Thou speakest, and be clear when Thou judgest. 

Psalm 51: 1-4