First Thursday
IV class
White
The First Thursday votive Mass may be said: “one Mass of our Lord Jesus Christ, eternal High Priest, on the first Thursday or the first Saturday of each month, in churches and oratories in which special devotions are held on that day for the sanctification of the clergy” (Rubricæ generales, 385a).
IV class Requiem Masses are not permitted during the IV class ferial days of Christmastide and Epiphanytide.
First Thursday votive: (White) Mass of our Lord Jesus Christ, eternal High Priest, Gloria, no Credo, common Preface.
OR
Ferial day: (White) Mass as on 1 January; Gloria; no Credo; preface of the Nativity without proper Communicantes.
Nota bene: The principal parts of the office during these seasonal ferias are from January 1, but are all listed together for convenience in the Ordinarium, under Time of the Nativity.
Matins: Invitatorium and Hymn from the Time of the Nativity; psalms and antiphons of the feria; scripture lessons proper to January 3; Te Deum
Lauds: Psalms and antiphons of the feria; capitulum and following from Time of the Nativity
Prime: Verse Qui natus es
Hours: Psalms and antiphons of the feria; capitulum and following from Time of the Nativity
Vespers: Psalms and antiphons of the feria; capitulum and following from Time of the Nativity