February 11, June 12, October 12
Chapter 9: How Many Psalms Are to Be Said at the Night Office
In winter time as defined above,
there is first this verse to be said three times:
“O Lord, open my lips,
and my mouth shall declare Your praise.”
To it is added Psalm 3 and the “Glory be to the Father,”
and after that Psalm 94 to be chanted with an antiphon
or even chanted simply.
Let the Ambrosian hymn follow next,
and then six Psalms with antiphons.
When these are finished and the verse said,
let the Abbot give a blessing;
then, all being seated on the benches,
let three lessons be read from the book on the lectern
by the brethren in their turns,
and after each lesson let a responsory be chanted.
Two of the responsories are to be said
without a “Glory be to the Father”
but after the third lesson
let the chanter say the “Glory be to the Father,”
and as soon as he begins it let all rise from their seats
out of honor and reverence to the Holy Trinity.
The books to be read at the Night Office
shall be those of divine authorship,
of both the Old and the New Testament,
and also the explanations of them which have been made
by well known and orthodox Catholic Fathers.
After these three lessons with their responsories
let the remaining six Psalms follow,
to be chanted with “Alleluia.”
After these shall follow the lesson from the Apostle,
to be recited by heart,
and the petition of the litany, that is “Lord, have mercy on us.”
And so let the Night Office come to an end.