From December 17 to 23, III and IV class votive and Requiem Masses are prohibited.
Mass of the previous Sunday; no Gloria; omit Alleluia with following verse; no Credo; common preface
Matins: Invitatorium Prope est iam Dominus; Hymn Verbum supernum; ferial psalms and antiphons; no Te Deum
Lauds: Ferial psalms of the 2nd scheme; antiphons are proper (they are given in the psalter: Feria II ante Vigiliam Nativitatis Domini); Nota bene: the Benedictus antiphon is proper to December 23 (printed in the proper section after the III Sunday of Advent): Ecce, completa sunt * omnia, quae dicta sunt per Angelum de Virgine Maria
Hours: Ferial psalms with antiphons from Lauds
Vespers: Ferial psalms and antiphons; Hymn Creator alme siderum; Magnificat O Emmanuel (O Antiphons for Advent)
Compline: Of the feria