Psalm 51:1-4

Have mercy upon me, O God. According to Your loving kindness, according to the multitude of Your tender mercies, blot out my transgressions.

Wash away my guilt and cleanse me from my sin, for I acknowledge my transgressions and my sin is ever before me.

Against You and You alone I have sinned and done this evil in Your sight, so You are right when You pass sentence, blameless when You judge.