The
liturgical use of these psalms came into Christianity through its Jewish roots. The form of the
Hebrew Bible used in
early Christianity was primarily the
Septuagint. In the Septuagint, these psalms are numbered 119–133. Many early
hermits observed the practice of reciting the entire
Psalter daily,
cenobites communities would chant the entire Psalter in a week, so these psalms would be said regularly, during the
canonical hours.
Eastern Christianity In the
Eastern Orthodox Church and those
Eastern Catholic Churches which follow the
Byzantine Rite, the Songs of Degrees (
Greek:
anabathmoi) make up the Eighteenth
Kathisma (division of the Psalter), and are read on Friday evenings at
Vespers throughout the
liturgical year. The Kathisma is divided into three sections (called
stases) of five psalms each. During
Great Lent the Eighteenth Kathisma is read every weekday (Monday through Friday evening) at Vespers, and on Monday through Wednesday of
Holy Week. In the
Slavic usage this Kathisma is also read from the
apodosis of the
Exaltation of the Cross up to the
forefeast of the
Nativity of Christ, and from the apodosis of
Theophany up to the
Sunday of the Prodigal Son. The reason for this is that the nights are longer in winter, especially in the northern latitudes, so during this season three Kathismata will be chanted at Matins instead of two, so in order to still have a reading from the Psalter at Vespers, the Eighteenth Kathisma is repeated.
Anabathmoi At
Matins on Sundays and
feast days throughout the year, special hymns called
anabathmoi (, from βαθμός, 'step';
Slavonic:
stepénny) are chanted immediately before the
prokeimenon and
Matins Gospel. These anabathmoi are compositions based upon the Songs of Ascents, and are written in the
eight tones of
Byzantine chant. The Anabathmoi for each tone consists of three
stases or sets of verses (sometimes called
antiphons), except for Tone 8 which has four stases. On Sundays, the anabathmoi are chanted according to the tone of the week; on feast days which do not fall on Sunday, the Anabathmoi almost always consist of the first stasis in Tone 4 (based on Psalm 128). Symbolically, the anabathmoi are chanted as a reminder that Christians are ascending to the
Heavenly Jerusalem, and that the spiritual intensity of the service is rising as they approach the reading of the
Gospel.
Western Christianity The Western
Daily Office was strongly influenced by the
Rule of Saint Benedict, where these psalms are assigned to
Terce,
Sext and
Nones on weekdays. Over the centuries, however, various schedules have been used for reciting the psalms. Among the laity, the devotion of the Fifteen Psalms was adopted within
primer prayer books. In the arrangement used in the Roman Rite until 1911, Psalms 119–132 are said at
Vespers, from Monday to Thursday, and Psalm 133 was one of the four Psalms said every day at
Compline. After the reform by
Pope Pius X in 1911, and continuing in the later reform by
Pope John XXIII in 1960, these psalms remained at Vespers, but not always on the same day as previously. Psalm 133 was said at
Compline only on Sundays and major feasts. The 1960 reform is still in use as the Extraordinary Form of the Roman Rite. In the modern
Liturgy of the Hours of the
Catholic Church, the Gradual Psalms are used in several ways: • Psalms 120–127 and 129–131 are scheduled throughout the four-week Psalter for use at Vespers; 119, 128, and 132 are scheduled for use for
Daytime Prayer, and 133 is scheduled for Night Prayer. • Psalms 119–127 are broken into three parts, to be used as the complementary Psalmody for those who pray three daytime offices separately as Terce, Sext, and None, rather than one office of Daytime Prayer. • They are used as the sole Psalmody at daytime prayer on
solemnities, except for certain solemnities of the Lord and during the
octave of Easter and those solemnities falling on Sunday. ==References==