I class
White
Feast of the Most Holy Trinity. I Sunday after Pentecost is not commemorated
The Asperges is resumed
Mass of the Feast; Gloria; Credo; Preface of the Holy Trinity
Matins: Invitatorium and hymn proper; antiphons, psalms, and lessons of the 3 nocturns are proper; Te Deum
Lauds: Proper antiphons, with Sunday psalms (1st scheme); remainder is proper
Prime: Proper antiphon, with Sunday psalms; Ps 53 instead of 117; the Athanasian Creed is added after the psalms
Hours: Proper antiphons, with Sunday psalms; remainder is proper
II Vespers: Proper antiphons, with Sunday psalms; remainder is proper
Compline: Of Sunday