Why did Jesus speak about the ministry of John the Baptist at the beginning of the four Gospels?

John the Baptist was a person who stood on the boundary between the Law and the Gospel. He was the last prophet of the Old Testament and at the same time the one who opened the door of the New Testament, pointing to the turning point from the age of the Law to the age of the Gospel.
Jesus’ receiving baptism from John was the fulfillment of the Word of the Law concerning the sins of mankind.
This baptism was not a mere ritual, but the work of salvation in which the sins of mankind were transferred to Jesus through John, and through this, God’s plan of salvation began to be realized.

The event of Jesus’ being baptized by John was the starting point for accomplishing the righteousness of God.
In Matthew 3:15, Jesus said, “Permit it to be so now, for thus it is fitting for us to fulfill all righteousness.” This word shows that the baptism of Jesus was not a mere religious act, but the first step toward the fulfillment of God’s righteousness—that is, the completion of the salvation of mankind.
Therefore, the mention of the ministry of John the Baptist at the beginning of the Gospels serves as an introduction proclaiming that Jesus was not merely one who performed miracles but the Savior who fulfilled the righteousness of God.

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