Have mercy on me, God, in your goodness;
in your abundant compassion blot out my offense.
Wash away all my guilt; from my sin cleanse me.
For I know my offense; my sin is always before me.
Against you alone have I sinned; I have done such evil in your sight
that you are just in your sentence, blameless when you condemn.
True, I was born guilty, a sinner, even as my mother conceived me.
Still, you insist on sincerity of heart; in my inmost being teach me wisdom.

Cleanse me with hyssop, that I may be pure; wash me, make me whiter than snow.
Let me hear sounds of joy and gladness; let the bones you have crushed rejoice.

Psalm 51:3-10