Psalm 51:1-7, 10

Have mercy on me, O God,
according to your unfailing love;
according to your great compassion
blot out my transgressions.
Wash away all my iniquity
and cleanse me from my sin.
For I know my transgressions,
and my sin is always before me.
Against you, you only, have I sinned
and done what is evil in your sight,
so that you are proved right when you speak
and justified when you judge.
Surely I was sinful at birth,
sinful from the time my mother conceived me.
Surely you desire truth in the inner parts;
you teach me wisdom in the inmost place.
Cleanse me with hyssop, and I shall be clean;
wash me, and I shall be whiter than snow.
Create in me a pure heart, O God,
and renew a steadfast spirit within me.