Rauner 003203 Folio 013v Chant 1 Beati estis
"Beati estis," the second responsory from the second nocturn of Matins, Common of Apostles
Beati estis cum maledixerint vobis homines et persecuti vos fuerint et dixerint omne malum adversum vos mentientes propter me | Gaudete et exultate quoniam merces vestra copiosa est in celis