The Rule of St. Benedict - Chapter 15. The Times For Saying Alleluia

(1) From the holy feast of Easter until Pentecost, "alleluia" is always said with both the psalms and the responsories.
(2) Every night from Pentecost until the beginning of Lent, it is said only with the last six psalms of Vigils.
(3) Vigils, Lauds, Prime, Terce, Sext, and None are said with "alleluia" every Sunday except in Lent; at Vespers, however, a refrain is used.
(4) "Alleluia" is never said with responsories except from Easter to Pentecost.

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