[Ut testimo]nium peri(b)eret

This GrV is lacking its beginning, hence it may correspond to the GrV Cantus ID g00237a.1 whose full text is 'Testimonium perhiberet de lumine et parare domino plebem perfectam'. I preferred to index this chant as g00237a because this variant is commony found in Portuguese sources (see http://cantusindex.org/id/g00237a).