“But when Herod died, behold, an angel of the Lord appeared in a dream to Joseph in Egypt, saying, “Rise, take the child and his mother and go to the land of Israel, for those who sought the child’s life are dead.” And he rose and took the child and his mother and went to the land of Israel. But when he heard that Archelaus was reigning over Judea in place of his father Herod, he was afraid to go there, and being warned in a dream he withdrew to the district of Galilee. And he went and lived in a city called Nazareth, that what was spoken by the prophets might be fulfilled: “He shall be called a Nazarene.”
In those days John the Baptist came preaching in the wilderness of Judea, “Repent, for the kingdom of heaven is at hand.” For this is he who was spoken of by the prophet Isaiah when he said, “The voice of one crying in the wilderness: ‘Prepare the way of the Lord; make his paths straight.’”
Now John wore a garment of camel’s hair and a leather belt around his waist, and his food was locusts and wild honey. Then Jerusalem and all Judea and all the region about the Jordan were going out to him, and they were baptized by him in the river Jordan, confessing their sins.
But when he saw many of the Pharisees and Sadducees coming to his baptism, he said to them, “You brood of vipers! Who warned you to flee from the wrath to come? Bear fruit in keeping with repentance. And do not presume to say to yourselves, ‘We have Abraham as our father,’ for I tell you, God is able from these stones to raise up children for Abraham. Even now the axe is laid to the root of the trees. Every tree therefore that does not bear good fruit is cut down and thrown into the fire.
“I baptize you with water for repentance, but he who is coming after me is mightier than I, whose sandals I am not worthy to carry. He will baptize you with the Holy Spirit and fire. His winnowing fork is in his hand, and he will clear his threshing floor and gather his wheat into the barn, but the chaff he will burn with unquenchable fire.”
Then Jesus came from Galilee to the Jordan to John, to be baptized by him. John would have prevented him, saying, “I need to be baptized by you, and do you come to me?” But Jesus answered him, “Let it be so now, for thus it is fitting for us to fulfill all righteousness.” Then he consented. And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him, and he saw the Spirit of God descending like a dove and coming to rest on him; and behold, a voice from heaven said, “This is my beloved Son, with whom I am well pleased.” (Matthew 2:19–3:17 ESV)
John the Baptist’s existence is confirmed by Josephus. Josephus has a separate but compatible tradition about John, which provides evidence of multiple attestation. The fact that John is to baptize Jesus is strange. It is clear that Jesus is superior but Jesus submits to the act. This is not something the early church would event and is thus an example of the criteria of embarrassment.
John’s role is to prepare the way for Jesus. This is described with an Old Testament quotation. Calling Jesus Lord seems innocent enough. However, in the Hebrew of this passage, ‘Lord’ is actually YHWH, the personal name of God. John is preparing for Jesus but Matthew describes John as preparing for YHWH. So much for the synoptics not being interested in the deity of Christ.
The presence of the Son’s baptism, the Father’s voice and the Spirit’s descent is an example of the activity of the Trinity.