Pascha quo victor rediens ab

Source: 
Washington, D.C., The Library of Congress - Music Division, M2.1 XII M11 [formerly M2.1 XI M2]
Folio: 
001r
Sequence: 
12
Feast: 
Octava Paschae
Genre: 
HV
Position: 
02
Cantus ID: 
008412b
Mode: 
?
Manuscript Reading Full Text (standardized spelling): 
Pascha quo victor rediens ab
Manuscript Reading Full Text (MS spelling): 
Pascha quo victor rediens ab
Indexing notes: 
There are a lot more words but there is no Index result that includes these. What should I do?