Responsorial Psalm: Psalm 50(51):3-4,12-15

A pure heart create for me, O God.

Have mercy on me, God, in your kindness.
  In your compassion blot out my offence.
O wash me more and more from my guilt
  and cleanse me from my sin.

A pure heart create for me, O God.

A pure heart create for me, O God,
  put a steadfast spirit within me.
Do not cast me away from your presence,
  nor deprive me of your holy spirit.

A pure heart create for me, O God.

Give me again the joy of your help;
  with a spirit of fervour sustain me,
that I may teach transgressors your ways
  and sinners may return to you.

A pure heart create for me, O God.