Baptism of Jesus
v.13-15 Jesus comes to John to be baptized saying: “thus it is fitting for us to fulfill all righteousness.” John implies that he needs Jesus’ spirit and fire baptism rather than Jesus needing John’s water baptism. The baptism identifies Jesus with those who are repenting of their sins and for whom his mission is to redeem.
v.16-17 The Spirit of God anoints Jesus as Israel’s king and messiah and identifies him also as God’s suffering servant with whom the father is “well pleased” (Is 42:1-4). Jesus is God’s unique son who has come to save his people. The voice is similar in purpose to that of Mt 17:5.

Read Matthew 3:13-17