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First Missionary Journey
23Of this man`s seed hath God according to promise brought unto Israel a Saviour, Jesus; 24when John had first preached before his coming the baptism of repentance to all the people of Israel. 25And as John was fulfilling his course, he said, What suppose ye that I am? I am not [he]. But behold, there cometh one after me the shoes of whose feet I am not worthy to unloose.
Acts 13:23-25 (ASV)