Baptism
Baptism in this chapter symbolizes repentance and the cleansing from sin. John the Baptist's baptism is a preparatory act for the coming of the Messiah, calling people to turn from their sins.
Baptism signifies the washing away of sins and the beginning of a new life in Christ. It prefigures Christian baptism, which is a public declaration of faith and identification with Jesus' death, burial, and resurrection.
In Jewish culture, ritual washing was common for purification. John's baptism was unique as it called for repentance in anticipation of the Messiah.