In our Evening Prayer today we use the last of the 7 great O Antiphons, O Emmanuel.
O Emmanuel, Rex et legifer noster,
exspectatio Gentium, et Salvator earum:
veni ad salvandum nos, Domine, Deus noster.
O Immanuel, you are our king and judge,
the One whom the peoples await and their Saviour.
O come and save us, Lord, our God.
"The Lord himself, therefore, will give you a sign. It is this: the maiden is with child and shall give birth to a son whom she will call Emmanuel." (Isaiah 7:14)