02-22# The Rule of our Holy Father Benedict. Chapter 18: In What Order the Psalms Themselves Are to Be Said. Continued.
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For Terce, Sext and None on Monday are to be said the nine remaining parts of the hundred and eighteenth psalm, three such parts at each of those hours. The hundred and eighteenth being thus exhausted in two days, namely, the Lord’s day and Monday, let there be sung on Tuesday three psalms apiece for Terce, Sext and None, from the hundred and nineteenth to the hundred and twenty-seventh, that is to say nine psalms. And let these psalms be repeated always in this way at these hours until the Lord’s day, a uniform arrangement of hymns, lessons and versicles being likewise observed on all days, in such wise, that is to say, that always on the Lord’s day a beginning will be made with the hundred and eighteenth.