15 John doth testify concerning him, and hath cried, saying, 'This was he of whom I said, He who after me is coming, hath come before me, for he was before me;' 16 and out of his fulness did we all receive, and grace over-against grace; 17 for the law through Moses was given, the grace and the truth through Jesus Christ did come; 18 God no one hath ever seen; the only begotten Son, who is on the bosom of the Father—he did declare.
19 And this is the testimony of John, when the Jews sent out of Jerusalem priests and Levites, that they might question him, 'Who art thou?' 20 and he confessed and did not deny, and confessed—'I am not the Christ.' 21 And they questioned him, 'What then? Elijah art thou?' and he saith, 'I am not.'—'The prophet art thou?' and he answered, 'No.' 22 They said then to him, 'Who art thou, that we may give an answer to those sending us? what dost thou say concerning thyself?' 23 He said, 'I 'am' a voice of one crying in the wilderness: Make straight the way of the Lord, as said Isaiah the prophet.' 24 And those sent were of the Pharisees, 25 and they questioned him and said to him, 'Why, then, dost thou baptize, if thou art not the Christ, nor Elijah, nor the prophet?' 26 John answered them, saying, 'I baptize with water, but in midst of you he hath stood whom ye have not known, this one it is who is coming after me, who hath been before me, 27 of whom I am not worthy that I may loose the cord of his sandal.'
Matthew Henry's Commentary on John 1:15-27
Commentary on John 1:15-18
(Read John 1:15-18)
As to the order of time and entrance on his work, Christ came after John, but in every other way he was before him. The expression clearly shows that Jesus had existence before he appeared on earth as man. All fulness dwells in him, from which alone fallen sinners have, and shall receive, by faith, all that renders them wise, strong, holy, useful, and happy. Our receivings by Christ are all summed up in this one word, grace; we have received "even grace," a gift so great, so rich, so invaluable; the good will of God towards us, and the good work of God in us. The law of God is holy, just, and good; and we should make the proper use of it. But we cannot derive from it pardon, righteousness, or strength. It teaches us to adorn the doctrine of God our Saviour, but it cannot supply the place of that doctrine. As no mercy comes from God to sinners but through Jesus Christ, no man can come to the Father but by him; no man can know God, except as he is made known in the only begotten and beloved Son.
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.