Christmas commemorates Christ’s birth.
“Now this is how the birth of Christ came about. When his mother Mary was betrothed to Joseph, but before they lived together, she was found with child through the Holy Spirit. Joseph her husband, since he was a righteous man, yet unwilling to expose her to shame, decided to divorce her quietly. Such was his intention, behold, the angel of the Lord appeared to him in a dream and said, ‘Joseph, son of David, do not be afraid to take Mary your wife into your home. For it is through the Holy Spirit that this child has been conceived in her. She will bear a son and you are to name him Jesus, because he will save his people from their sins. All this took place to fulfill what the Lord had said through the prophet.’
He had no relations with her until she bore a son, and he named him Jesus.” (Mt 1:18-22, 25)
“For it is through the Holy Spirit that this child has been conceived in her,” the angel told Joseph, attests the participation of the Holy Spirit in Christ’s birth, and “he will save his people from their sins,” continued the angel, expressing Christ’s redemptive mission.
Saint Matthew’s gospel shows Christ met all messianic prophecies. Only a Jewish nucleus accepted the Messiah, but the Gentiles rejoiced with the Good News preached by the Apostle Paul and his disciples.
“Now there were shepherds in that region living in the fields and keeping the night watch over their flock. The angel of the Lord appeared to them and the glory of the Lord shone around them, and they were struck with great fear. The angel said to them, ‘Do not be afraid; for behold, I proclaim to you good news of great joy that will be for all the people. For today in the city of David a savior has been born for you who is Messiah and Lord. And this will be a sign for you: you will find an infant wrapped in swaddling clothes and lying in a manger.’ And suddenly there was a multitude of the heavenly host with the angel, praising God and saying:
‘Glory to God in the highest and on earth peace to those on whom his favor rests.’
So they went in haste and found Mary and Joseph, and the infant lying in the manger.
Then the shepherds returned, glorifying and praising God for all they had heard and seen, just as it had been told to them.” (Lc 2:8-14,16,20)
The shepherds rushed to see the infant. They did not carry gifts, because they were so poor, but adored Jesus, and “returned, glorifying and praising God.”