These are the lyrics to an Anunciation Carol. I am not sure if it is "The Anunciation Carol." Apparently there are several carols that were written about this event.
Tidings true there be come new, Sent from the Trinity, By Gabriel from Nazareth, To city of Galilee; A clean maiden, and pure virgin Through her humility Hath conceived the Person Second in Deity.
Nowell, Nowell, Nowell, Nowell. This is the salutation fo the Angel Gabriel.
There are three other verses if you are interested. I have used these words with a tune that is really nice, but I am interested in finding "The Anunciation Carol"