Rauner 003203 Folio 028r Chant 3 Estote fortes
"Estote fortes," an antiphon before the Magnificat canticle from the office of Second Vespers, Feast of St. Matthew, Apostle
Estote fortes in bello et pugnate cum antiquo serpente et accipietis regnum eternum alleluia | ~Magnificat