A. In the Old Testament, atonement was usually given through the sacrifice of an animal (ex. Exodus 30:10, Leviticus 1:3-5, 4:20-21, 16:6-22).
B. In the New Testament, the concept of the sacrifice of atonement of the Old Testament was basically maintained, but the redemption of all humankind could be fulfilled only by offering the body of Jesus Christ, the Son of God. The Apostle Paul said Jesus Christ died for our sins (1 Corinthians 15:3).
The word atonement was not only used to refer to the death of Christ to expiate original sin, but to take away all the sins of all human beings. After the baptism through which the sins of the world were passed onto Jesus (Matthew 3:15), He saved humankind by bleeding on the Cross (Leviticus 1:1-5, John 19:30).
The Apostle Paul explains in 2 Corinthians 5:14 that ‘One died for all,’ then, in the following verse 21, he stated it was ‘for us,’ and again in Galatians 3:13, ‘having become a curse for us.’ Only a few verses in the New Testament refer to Jesus as the Sacrifice (ex. Ephesians 5:2): John 1:29, 36 (‘Lamb’—John the Baptist) and 1 Corinthians 5:7 (‘our Passover’—the Apostle Paul).
However, Paul specified that the baptism of Jesus in the Jordan was the atonement for all the sins of the world. He explains in Romans 6 that all the sins of the world were passed onto Jesus through His baptism by John the Baptist.
He goes on to explain that the crucifixion of Jesus was the judgment and compensation for sin, and that the sacrifice of atonement was offered for the souls of all people.
The death of Jesus was the realization of God’s plan, implied in the sacrifice of atonement in the Old Testament. The laying on of hands in the Old Testament and the baptism of Jesus in the New Testament are in accordance with the Law of God (Isaiah 53:10, Matthew 3:13-17, Hebrews 7:1-10, 18, 1 Peter 3:21).
The New Testament does not end with the baptism and the death of Jesus, but goes on to tell us that the fulfillment of salvation is our being baptized into Christ, which enables our old selves to die with Him (Romans 6:3-7, Galatians 2:19-20).
It tells us that John the Baptist baptized Jesus Christ to take away all the sins of the world and that as a result, He was crucified. Jesus Christ, through His baptism and blood, not only washed away the sins of the world, but also saved us from the power of Satan and returned us to the power of God by accepting punishment and enduring the pain in the place of mankind.
Therefore, the redemption of Jesus solved the problem of sin that was blocking people from being close to God. This momentous event restored peace and harmony between people and God, bringing salvation, joy (Romans 5:11), life (Romans 5:17-18), and redemption (Matthew 3:15, John 1:29, Hebrews 10:1-20, Ephesians 1:7, Colossians 1:14) at the same time.