O Emmanuel — December 23

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

http://www.youtube.com/watch?v=Zt9W9Kc_hzo&feature=channel

O Emmanuel, king and lawgiver, desire of the nations, Savior of all people, come and set us free, Lord our God. — translation in current Catholic Liturgy of the Hours

O come, O come, Emmanuel / And ransom captive Israel / That mourns in lonely exile here / Until the Son of God appear. — Verse translation in "O Come, O Come, Emmanuel"

O Emmanuel — Isaiah 7:14, Matthew 1:23

Rex et legifer noster — our king and lawgiver — Isaiah 33:22, 43:15

exspectatio gentium — the one awaited by the nations (gentiles) — Isaiah 41:1, 42:4

Salvator earum — their savior — Zechariah 9:9 Isaiah 12:2, 49:6, John 4:42