In the Ordinariate Mass rite, immediately before the Communion Antiphon comes a threefold adaptation of the Centurion's act of faith from Matthew 8:8:

Lord, I am not worthy that thou shouldest come under my roof, but speak the word only, and my soul shall be healed.
Lord, I am not worthy that thou shouldest come under my roof, but speak the word only, and my soul shall be healed.
Lord, I am not worthy that thou shouldest come under my roof, but speak the word only, and my soul shall be healed.

Not Worthy is a setting for unison voices and organ of this text, written originally for the use of the Ordinariate in Chichester, West Sussex. It's for unison voices, reflecting both the distribution of singers in the Chichester choir and the desire of the congregation there to join in with the singing. It should therefore be easy to adopt this piece into other Ordinariate groups.

Care should be taken that those rhythms which look fiddly not be made to sound fiddly; the singers should adopt an unhurrying rubato, and not be too percussive in their enunciation.