This is the O Antiphon for today, 23rd December.
O Immanuel, Rex et legifer noster,
exspectatio Gentium, et Salvator earum:
veni ad salvandum nos, Domine, Deus noster.
O Immanuel, our king and our lawgiver,
the hope of the nations and their Saviour:
Come and save us, O Lord our God.