In Orthodox churches, the celebration of Vespers is somewhat different from the service of Vespers (everyday). First of all, this is manifested in some special holiday chants performed by the choir.
Festive Vespers at the service of the All-Night Vigil begins with the singing of the 103rd psalm. This chant tells of the act of God creating the world. Psalm 103 glorifies the greatness of God; the Lord is called blessed. The chant itself begins with a call to the human soul for the blessing of the Creator. At this time, the priest performs the incense of the temple.
Among the special solemn hymns of the festive Vespers, “Blessed is the husband”. These are a few short verses from the first kathisma, which say that blessed is a person who does not engage in unclean affairs and does not participate in unrighteous gatherings.
Another hymn of the festive Vespers is a prayer appeal to God, which is briefly called "Lord, Compassionate." In it, the believer asks the Lord to grant a person to live an evening without sin. Also in this chant praise, glory and honor are given to all three Persons of the Holy Trinity.
At the end of Vespers, the choir performs the Christian hymn, “Now let go.” This is the prayer of the righteous elder Simeon, which is written in the gospel. The old man was foretold that he would not die until he saw the born baby of Christ. When the Mother of God brought baby Jesus on the fortieth day to the temple to dedicate the latter to God, Elder Simeon took the baby into his own hands and said the words of prayer that now the Lord (God) is letting his slave out of this earthly life with the world.
At the end of the festive Vespers, special solemn troparia dedicated to the holiday is performed. Also, the choir can sing the prayer to the Most Holy Theotokos "Hail Mary, Hail." The words of the archangel Gabriel spoken to the Virgin Mary on the day of the annunciation are used in prayer.
The final feast of Vespers is the 33rd psalm. More truly, its first part in which the believing person again gives glory to God for the day lived.
