On Christmas Day, the Church traditionally celebrates three Masses. The first of these Masses takes place at midnight and is a celebration of the birth of Christ in time from the Virgin Mary in Bethlehem. The Gospel for this Mass is the birth of Jesus and the appearance of the angels to the shepherds.
Ant. The Lord said unto me, “Thou art my Son; today I have begotten Thee.”
V. Why have the Gentiles raged, and the people devised vain things?
V. Glory be…
Let the heavens rejoice and let the earth be glad before the face of the Lord, because He comes.
Ant. In the splendor of the Saints, from the womb before the day-star, I have begotten Thee.