Luke 3:21-38  Jesus went to John by the Jordan River to be baptized.  Even John recognized that Jesus had no need for repentance and baptism.. but Jesus insisted that  it should be "permitted... for in this way it is fitting for us the fulfill all righteousness." ( Matthew 3:15) 

So much happens in this action... Jesus submitted to the Father's will and the Father was "well-pleased". The "heavens were opened". The Holy Spirit descended "like a dove" and came upon Jesus.

John (the baptist) testified " I have beheld the Spirit descending as a dove out of heaven and He remained on Him." John 1:31-34 explains that this was a sign to John the Baptist that this was the One he had been told. about... "He upon whom you see the Spirit descending and remaining upon Him, this is the one who baptizes in the Holy Spirit." (v33) 

The baptism also signals the beginning of Jesus' public ministry.

Verses 23-38 give another genealogy for Jesus.. from His earthly "supposed" father Joseph back to the very beginning.. to Adam " the son of God".  Although this list differs from Matthew's they both substantiate that legally Jesus was of the line of David and therefore of royal heritage...a legitimate King of Israel. 

Chapter 4 begins with a significant entrance into Jesus' ministry... He was led by the Spirit of God into the wilderness and for forty days He fasted.  He was there alone until the devil came to tempt Him.  Forty days with no food and no hunger.  Forty days of preparation for the days ahead,  which would begin with the confrontation with Satan. 

Father in heaven, we are so thankful for such a worthy Savior sent from You to lead us into all righteousness.  Thank You for the Word that leads us into the Light of Your salvation. Thank You that the Word of God became flesh and dwelt on earth so that we might be saved from sin, death, and the evil one. Thank You Jesus for being willing to humble Yourself, empty Yourself, and give Yourself for me. Help me,  Holy Spirit,  to understand more fully the greatness of this salvation in Jesus Christ the Lord. Amen.