Baptism
Baptism in this chapter symbolizes repentance and the cleansing from sin, as John the Baptist calls people to prepare for the coming of the Lord.
Baptism represents the washing away of sins and the beginning of a new life in Christ. It prefigures Christian baptism, which signifies identification with Christ's death, burial, and resurrection.
In Jewish tradition, ritual washing was a common practice for purification. John's baptism was a radical call to repentance and preparation for the Messiah.