[Officium] St. Sixtus II, Pope, and Companions, Martyrs [Rule] vide C3; [Oratio] O God, Who permits us to celebrate the anniversary of the death of Your holy Martyrs, Saints Sixtus, Felicissimus and Agapitus, grant that we may enjoy their companionship in everlasting happiness. $Per Dominum [Postcommunio] Grant, we beseech You, O almighty and merciful God, that through the intercession of Your holy Martyrs, Sixtus, Felicissimus, and Agapitus, what we take into our mouths we may eat with pure heart. $Per Dominum