O Come Emmanuel, O Antiphon for Dec. 23

On Dec. 23, the last of the Great O antiphons of Advent begins by addressing our Savior with the Messianic name, Emmanuel, which means God with us. The antiphon then echoes His title as king (from O Rex Gentium), adds the title of lawgiver, repeats that He is the hoped for One (longed for) and Savior of the nations. It ends with a petition, "come and save us.”

O Emmanuel, Rex et legifer noster, exspectatio gentium, et Salvator earum: veni ad salvandum nos, Domine, Deus noster. 

O Emmanuel, our king and lawgiver, longing of the nations and Savior thereof: Come and save us, O Lord our God.

Related Hymn Verses

Here are the corresponding modified hymn verses from "Veni, Veni, Emmanuel" and "O Come, O Come Emmanuel." The English verse uses "King of the nations."

Veni, veni, Emmanuel,
Captivum solvet Israel
Qui gemit in exsilio
Privatus Dei Fillio

O come, o come, Emmanuel,
And ransom captive Israel,
That mourns in lonely exile here,
Until the Son of God appears.

Scriptural Origins

Isaiah 7:14 Therefore the Lord himself will give you a sign. Behold, a young woman^[ shall conceive and bear a son, and shall call his name Imman′u-el.

Matthew 1:20b-23: "[T]hat which is conceived in her is of the Holy Spirit; she will bear a son, and you shall call his name Jesus, for he will save his people from their sins.” All this took place to fulfil what the Lord had spoken by the prophet: “Behold, a virgin shall conceive and bear a son,
and his name shall be called Emman′u-el” (which means, God with us).

Dom Gueranger's Commentary about O Emmanuel:

O Emmanuel ! King of peace! Thou enterest today the city of Thy predilection, the city in which Thou hast placed Thy temple—Jerusalem. A few years hence the same city will give Thee Thy cross and Thy sepulchre: nay, the day will come on which Thou wilt set up Thy judgement-seat within sight of her walls. But to-day Thou enterest the city of David and Solomon unnoticed and unknown. It lies on Thy road to Bethlehem. Thy blessed Mother and Joseph her spouse would not lose the opportunity of visiting the temple, there to offer to the Lord. their prayers and adoration. They enter; and then, for the first time, is accomplished the prophecy of Aggeus, that great shall be the glory of this last house more than of the first ; ¹ for this second temple has now standing within it an ark of the Covenant more precious than was that which Moses built; and within this ark, which is Mary, is contained the God whose presence makes her the holiest of sanctuaries. The Lawgiver Himself is in this blessed ark, and not merely, as in that of old, the tablet of stone on which the Law was graven. The visit paid, our living ark descends the steps of the temple, and sets out once more for Bethlehem, where other prophecies are to be fulfilled. We adore Thee, O Emmanuel ! in this Thy journey, and we reverence the fidelity wherewith Thou fulfillest all that the prophets have written of Thee; for Thou wouldst give to Thy people the certainty of Thy being the Messias, by showing them that all the marks, whereby He was to be known, are to be found in Thee. And now, the hour is near; all is ready for Thy birth; come then, and save us; come, that Thou mayst not only be called our Emmanuel, but our Jesus, that is, He that saves us.

More

Here is a link from New Liturgical Movement that includes a link to a sound file of the chant.

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See "History and Mystery: The O Antiphons in a Favorite Hymn" for my post on the relationship between the O antiphons,"Veni, Veni, Emmanuel" and "O Come, O Come Emmanuel."