As an American tradition, we start the  Christmas story with the angels bring a message to Mary then some times Joseph. There is more to the story than the angels predictions but a host of old testament promises and prophecy that is being fulfilled.  Main text is Luke 1:26-38.

There is also a reading from page 861 in the Hymnal, Psalms 148. The affirmation of faith is on page 880, The Nicene Creed. 

Additional verses mentioned:
Prophetic verses 2 Samuel 7:12–16, Isaiah 11:1, Jeremiah 23:5–6, Isiah 7:14
Joseph Dream Matthew 1:18-25