Nine months before the Feast of the Nativity of the Lord, the Feast of the Annunciation is celebrated: the day when an angel was sent to Mary and revealed to her that she had been chosen to be the mother of the Messiah, the Son of God . A feast of "Annunciation of the Nativity of the Lord" is celebrated in the Eastern Church as early as 550 on March 25; in Rome it was introduced in the 7th century.

Mary was welcomed by the angels as the woman most loved and blessed by God above all. He stood in the ranks of the great elect (Abraham, David) and towered above them all.

What is said to Mary about Jesus (Luke 1:31-33) goes far beyond what is said about John (Luke 1:15-17). His name marks him as the promised Messiah of the last days, who will restore the unity of Judah and Israel and reign over all nations forever. He is a true man and also belongs to God's world (1:35). But unlike Zechariah (1:18), Mary answered the angel's message with simple words: Yes, let it be done to me according to your will .