Today is day 5 of the 12 days of Christmas.
The focus is on the Holy Family (Joseph, Mary, and Jesus), and the Gospel passage is about the flight into Egypt -- to escape Herod's attempt to kill Jesus.
When the magi 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" [Hosea 11:1]....
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....
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" [unknown reference].
Matthew 2:13-14, 19-21, 22b-23