+ Mt 2: 13-15. 19-23
When they had departed, behold, the angel of the Lord appeared to Joseph in a dream and said, “Rise, take the child and his mother, flee to Egypt, and stay there until I tell you. Herod is going to search for the child to destroy him.”
Joseph rose and took the child and his mother by night and departed for Egypt.
He stayed there until the death of Herod, that what the Lord had said through the prophet might be fulfilled, “Out of Egypt I called my son.”
When Herod had died, behold, the angel of the Lord appeared in a dream to Joseph in Egypt
and said, “Rise, take the child and his mother and go to the land of Israel, for those who sought the child’s life are dead.”
He rose, took the child and his mother, and went to the land of Israel.
But when he heard that Archelaus was ruling over Judea in place of his father Herod, he was afraid to go back there. And because he had been warned in a dream, he departed for the region of Galilee.
He went and dwelt in a town called Nazareth, so that what had been spoken through the prophets might be fulfilled, “He shall be called a Nazorean.”
Source: New American Bible
Catechism of the Catholic Church
333 From the Incarnation to the Ascension, the life of the Word incarnate is surrounded by the adoration and service of angels. When God “brings the firstborn into the world, he says: ‘Let all God’s angels worship him.'” Their song of praise at the birth of Christ has not ceased resounding in the Church’s praise: “Glory to God in the highest!” They protect Jesus in his infancy, serve him in the desert, strengthen him in his agony in the garden, when he could have been saved by them from the hands of his enemies as Israel had been. Again, it is the angels who “evangelize” by proclaiming the Good News of Christ’s Incarnation and Resurrection. They will be present at Christ’s return, which they will announce, to serve at his judgement.
530 The flight into Egypt and the massacre of the innocents make manifest the opposition of darkness to the light: “He came to his own home, and his own people received him not.” Christ’s whole life was lived under the sign of persecution. His own share it with him. Jesus’ departure from Egypt recalls the exodus and presents him as the definitive liberator of God’s people.