Verse:
“Therefore, since we have these promises, dear friends, let us purify ourselves from everything that contaminates body and spirit, perfecting holiness out of reverence for God.” -2 Corinthians 7:1
Prayer For Purification of the Heart
Purify my heart O Lord my God, for I love and trust You and desire to be set apart unto You, in holiness and righteousness all the days of my life. I desire to be holy for You are holy and You have called all Your children to be set apart unto You, and to be refined in the refining fires of Your purifying love and unimaginable grace, so that we may come forth as pure gold in Your sight. Amen.
Sources:
Original version of the prayer: https://prayer.knowing-jesus.com/prayer/prayer-to-purify-my-heart-unto-god-1111