God gave the Israelites His Law through Moses as well as the sacrifice of redemption so that they could attain atonement for their sins and iniquities. He ordained Aaron, the brother of Moses, as the high priest and had him offer the sacrifice of atonement on the tenth day of the seventh month, the Day of Atonement, so that a year of Israel’s sins could be washed away (Leviticus 16).
He specified that the sacrifice of the Day of Atonement could only be offered by the descendants of Aaron. God opened the way for the Israelites to atone for all their sins through the laying on of hands, the sacrifice of atonement offered by Aaron and his descendants. This is the law of atonement God established for us.
He let it be known clearly that Jesus is the Savior of mankind. In the age of the New Testament, John the Baptist was a descendant of Aaron and the last high priest of the Old Testament. And John the Baptist, as the Prophet of God and the representative and high priest of humankind, baptized Jesus, the Son of God, who came to save sinners and passed all the sins of humankind on to His head.
All people are blessed indeed to be able to pass their sins on to Jesus through John the Baptist; the role of John was the high priest representing humankind, the servant of God who passed all our sins on to Jesus.
John the Baptist is the representative and the high priest of humankind sent by God and the messenger who was sent 6 months before Jesus. On the other hand, Jesus was the Lamb of God who took away all the sins of the world while John the Baptist was the high priest who passed the sins of the world on to Jesus through baptism. John the Baptist was the servant of God.