"Suddenly a great company of the heavenly host appeared with the angel, praising God and saying, 'Glory to God in the highest heaven and on earth peace to those on whom his favor rests.'
When the angels had left them and gone into heaven, the shepherds said to one another 'Let's go to Bethlehem and see this thing that has happened, which the Lord has told us about'." Luke 2:13-15.
In the Annunciation the angel spoke to Mary "The Holy Spirit will come upon you, and the power of the Most High will overshadow you. So the holy one to be born will be called the Son of God." Luke 1:35