Source: PL-Wn 12720 V Antyfonarz opata Mścisława z Tyńca, pars de temporeFolio: 0044rSequence: 6Feast: Vigilia Nat. DominiOffice: PGenre: ACantus ID: 001440Mode: 1Differentia: g1Full text: Antequam convenirent inventa est Maria habens in utero de spiritu sancto alleluia