+ Mt 2: 13-18
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 realized that he had been deceived by the magi, he became furious. He ordered the massacre of all the boys in Bethlehem and its vicinity two years old and under, in accordance with the time he had ascertained from the magi.
Then was fulfilled what had been said through Jeremiah the prophet:
“A voice was heard in Ramah, sobbing and loud lamentation; Rachel weeping for her children, and she would not be consoled, since they were no more.”
Source: New American Bible
Catechism of the Catholic Church
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.
The Massacre of the Innocents is the biblical account of infanticide by Herod the Great, the Roman-appointed King of the Jews. According to the Gospel of Matthew, Herod ordered the execution of all young male children in the vicinity of Bethlehem, so as to avoid the loss of his throne to a newborn King of the Jews whose birth had been announced to him by the Magi. In typical Matthean style, it is understood as the fulfillment of an Old Testament prophecy: “Then was fulfilled that which was spoken through Jeremiah the prophet, saying, ‘A voice is heard in Ramah, mourning and great weeping, Rachel weeping for her children and refusing to be comforted, because her children are no more.'” The number of infants killed is not stated. The Holy Innocents, although Jewish, have been claimed as martyrs for Christianity.