Ember Friday in the Octave of Pentecost is the second of the summer Quarter-Tense days. It is of semi-double rite. The liturgical colour is the red of the Octave.
The Office is as on the feast, except for those parts that are proper, but the antiphons at Mattins, Lauds and Vespers are not doubled. At Mattins the invitatory, hymn, antiphons and psalms are those that were sung on the feast. The versicle and response are proper to the day. The lessons of the homily are taken from the writings of St. Ambrose on St. Luke's Gospel. At Lauds the antiphon on the Benedictus and collect are proper to the day. A commemoration is sung of St. Augustine of Canterbury.
At the Hours all is celebrated as on Pentecost Sunday. At Terce the hymn is Veni Creator. The Pentecost Doxology is sung at the conclusion of hymns of Iambic metre.
Mass is sung after None, as on the Ember Days of the other seasons. Unlike the other Ember Days the deacon and subdeacon do not wear folded chasubles as the colour of the Octave is used. The Mass is proper with the introit Repleatur os meum etc. The Gloria is sung, the second collect is of St. Augustine. The sequence Veni Sancte Spiritus is sung, the Creed is sung, the preface, Hanc igitur and communicantes are of Pentecost.
Vespers are as on the feast, except the antiphons are not doubled. The antiphon on the Magnificat and collect are proper. Commemorations are sung of St. Mary Magdalen dei Pazzi and St. Augustine.