19 And this is the testimony of John, when the Jews sent priests and Levites from Jerusalem to ask him, "Who are you?" 20 He confessed, and did not deny, but confessed, "I am not the Christ." 21 And they asked him, "What then? Are you Elijah?" He said, "I am not.""Are you the Prophet?" And he answered, "No." 22 So they said to him, "Who are you? We need to give an answer to those who sent us. What do you say about yourself?" 23 He said, "I am the voice of one crying out in the wilderness, 'Make straight[1] the way of the Lord,' as the prophet Isaiah said." 24 (Now they had been sent from the Pharisees.) 25 They asked him, "Then why are you baptizing, if you are neither the Christ, nor Elijah, nor the Prophet?" 26 John answered them, "I baptize with water, but among you stands one you do not know, 27 even he who comes after me, the strap of whose sandal I am not worthy to untie." 28 These things took place in Bethany across the Jordan, where John was baptizing.
Matthew Henry's Commentary on John 1:19-28
Commentary on John 1:19-28
(Read John 1:19-28)
John disowns himself to be the Christ, who was now expected and waited for. He came in the spirit and power of Elias, but he was not the person of Elias. John was not that Prophet whom Moses said the Lord would raise up to them of their brethren, like unto him. He was not such a prophet as they expected, who would rescue them from the Romans. He gave such an account of himself, as might excite and awaken them to hearken to him. He baptized the people with water as a profession of repentance, and as an outward sign of the spiritual blessings to be conferred on them by the Messiah, who was in the midst of them, though they knew him not, and to whom he was unworthy to render the meanest service.