Acts 13:25

And as John fulfilled his course, he said, Whom think ye that I am? I am not He. But, behold, there cometh One after me whose shoes of His feet I am not worthy to loose.

With the mention of David, the great hero of Jewish history, Paul had opened the way to his main theme, the promise, the appearance, and the work of David's promised Son. It was no longer necessary for the Jews or for any other nation in the world to look forward to the Messiah's coming, since God had, according to His promise 2 Samuel 7:12, brought to Israel, out of the offspring of David, Jesus, the Savior. And this event had received further confirmation by the fact that John, in preparation for His coming, before the face of His entering in, had preached a baptism of repentance to the entire people of Israel. John's was also a baptism of repentance; by coming to the baptism of John, the sinner made a public acknowledgment of the fact that he was a sinner, and that he sought remission of sins by the water of Baptism. And as John was fulfilling his course, near the end of his career as preacher of repentance, he had publicly testified in favor of Christ: Whom do you suppose me to be? I am not He; but He comes after me whose sandals I am not worthy to bear, Matthew 3:11; Mark 1:7; Luke 3:16; John 1:19.