The Responsorial Psalm for the Fifth Sunday of Lent is a renowned hymn of sorrow for sin and repentance:

Psalm 51:3-4,12-15: “Have mercy on me, O God, in your goodness;
in the greatness of your compassion wipe out my offense.
Thoroughly wash me from my guilt
and of my sin cleanse me.

A clean heart create for me, O God,
and a steadfast spirit renew within me.
Cast me not out from your presence,
and your Holy Spirit take not from me.

Give me back the joy of your salvation,
and a willing spirit sustain in me.
I will teach transgressors your ways,
and sinners shall return to you.”

(Via USCCB.)

It also served as the response for a Mass early in Lent (Friday after Ash Wednesday). That post is here:

Have mercy on me, Lord.

This psalm deserves your great attention.

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