From the sacred feast of Easter until Pentecost let Alleluia be said always both with the psalms and with the responsories. From Pentecost until the beginning of Lent let it be said every night at Matins with the second six psalms only. On every Sunday out of Lent let Alleluia be said with the canticles of Matins, and with the psalms of Lauds, Prime, Terce, Sext and None; but let Vespers then have an antiphon. The responsories are never to be said with Alleluia, except from Easter to Pentecost.