At the time of Jesus, baptism was already a custom showing repentance and a sense of recommitment to the spiritual life. Culturally, ritual bathing could be the sign of inner spiritual cleansing. Of course, Jesus himself had no need of cleansing. Being God Incarnate, he was free of all sin. So why did he need go through baptism? In fact, in the Gospel of Matthew, John the Baptist himself wonders why Jesus would want to be baptized by him, given that Jesus is the Lord.
Two reasons come to the fore as to why Jesus had John baptize him. One was to set an example for his future followers. Jesus made baptism the foundational sacrament of the Church, the entryway into the new life of salvation he offers to all of humanity. Even though Jesus did not need to get baptized, he underwent baptism to show the way.
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