The Great O Antiphons, used to bookend the Magnificat in Vespers in the last seven days before Christmas. The Treasury of Daily Prayer includes them in the daily propers section. As each of these Old Testament names for God is prayed, and Christ is invoked to come to us, the clarity of whom the Blessed Mother bore is driven home in an unmistakable way, climaxing in the confession that He is Emmanuel, God with us. The hymn of the day for the fourth Sunday in Advent is the versification of these antiphons “O Come, O Come, Emmanuel.”
O Dayspring, splendor of light everlasting: Come and enlighten those who sit in darkness and in the shadow of death.
Chapter: Malachi 4,2
Unto you that fear my name, the Sun of justice shall arise, and health in his wings.
The Prayer – Enlighten our minds, we beseech Thee, Lord, by the grace of Thy visitation; that of Thy bounty we may merit to be humble in prosperity, and safe in adversity. Who with the Father.