O come, O come, Emmanuel,
and ransom captive Israel,
that mourns in lonely exile here
until the Son of God appear.

Refrain:
   Rejoice! Rejoice!
   Emmanuel
   shall come to thee, O Israel.

O come, thou Wisdom from on high,
who orderest all things mightily;
to us the path of knowledge show,
and teach us in her ways to go.  

O come, thou Rod of Jesse, free
thine own from Satan’s tyranny;
from depths of hell thy people save,
and give them victory over the grave.

O come, thou Dayspring, come and cheer
our spirits by thine advent here;
disperse the gloomy clouds of night,
and death’s dark shadows put to flight.

Latin hymn from the 12th century

Isaiah 7:14 

Therefore the Lord himself will give you a sign.
Behold, the virgin shall conceive and bear a son,
   and shall call his name Immanuel.