For Cleansing

O Lord,
cleanse us from our secret faults,
and mercifully forgive us from our willful sins,
that we may receive your holy things with a pure mind;
through Jesus Christ our Lord.
Amen.

Source: Leonine Sacramentary.

Source of this version: Freely modified from  Prayers of the Early Church,  ed.  J. Manning Potts,  The Upper Room, Nashville, Tennessee, © 1953 (Public domain in the U.S.)

“cleanse us from our secret faults” is a reference to Psalm 19:12-13