The Rule of St. Benedict · 11 of 69
Chapter 10: How in summer the nocturnal praise shall he carried on
From Easter moreover until the Calends of November, the whole quantity of psalmody, as has been said above, shall be observed: except that the lessons from the Scripture, on account of the shortness of the nights, shall not be read at all. But in place of those three lessons, one from the old Testament shall be said by memory, and a short response shall follow it. And everything else shall be carried out as has been said; that is, so that never less than the number of twelve psalms shall be said at nocturnal vigils; excepting the third and ninety fourth psalm.