Art thou he who was to come? John takes for granted what the disciples had known from their childhood; for it was the first lesson of religion, and common among all the Jews, that Christ was to come, bringing salvation and perfect happiness. On this point, accordingly, he does not raise a doubt, but only inquires if Jesus be that promised Redeemer; for, having been persuaded of the redemption promised in the Law and the Prophets, they were bound to receive it when exhibited in the person of Christ. He adds, Do we look for another? By this expression, he indirectly glances at their sloth, which allowed them, after having been distinctly informed, to remain so long in doubt and hesitation. At the same time, he shows what is the nature and power of faith. Resting on the truth of God, it does not gaze on all sides, does not vary, but is satisfied with Christ alone, and will not be turned to another.

Art thou he that should come? - That is, Art thou the Messiah, or the Christ? The Jews expected a Saviour. His coming had been long foretold, Genesis 49:10; Isaiah 9:1-6; Isaiah 11:1-5; Isaiah 35:4-6; Isaiah 53:1-12; Daniel 9:24-27. See also John 6:14. Compare Deuteronomy 18:18-19. In common language, therefore, he was familiarly described as "he that was to come." Luke adds here Luke 7:21, that at the time when the messengers came to him, Jesus "cured many of their infirmities, and plagues, and of evil spirits." An answer was therefore ready to the inquiries of John.

Art thou he that should come - Ο ερχομενος, he that cometh, seems to have been a proper name of the Messiah; to save or deliver is necessarily implied. See on Luke 7:19 (note).
There is some difficulty in what is here spoken of John. Some have thought he was utterly ignorant of our Lord's Divine mission, and that he sent merely for his own information; but this is certainly inconsistent with his own declaration, Luke 3:15, etc.; John 1:15, John 1:26, John 1:33, John 3:28, etc. Others suppose he sent the message merely for the instruction of his disciples; that, as he saw his end approaching, he wished them to have the fullest conviction that Jesus was the Messiah, that they might attach themselves to him.
A third opinion takes a middle course between the two former, and states that, though John was at first perfectly convinced that Jesus was the Christ, yet, entertaining some hopes that he would erect a secular kingdom in Judea, wished to know whether this was likely to take place speedily. It is very probable that John now began, through the length of his confinement, to entertain doubts, relative to his kingdom, which perplexed and harassed his mind; and he took the most reasonable way to get rid of them at once, viz. by applying to Christ himself.
Two of his disciples - Instead of δυο, two, several excellent MSS., with both the Syriac, Armenian, Gothic, and one copy of the Itala, have δια, by; he sent by his disciples.

And said unto him,.... By the disciples he sent; this was the message they came with, and this the question they were to ask, and did,
art thou he that should come? A "periphrasis" of the Messiah, well known to the Jews; for he had been spoken of frequently in the prophecies of the Old Testament, as the Shiloh, the Redeemer, the Prophet, and King that should come; particularly, by this circumlocution, reference seems to be had to Habakkuk 2:3. "It shall surely come", , which may be rendered, "for he that cometh", or "is to come, shall come". So that the question in plain terms is, whether he was the Messiah? John could not be ignorant of this, who had seen the Spirit of God descending on him at his baptism, heard a voice from heaven, declaring him the Son of God; and had so often pointed him out to others, and had borne frequent testimonies that he was the Lamb of God, and bridegroom of his church: wherefore this question was put, not upon his own account, but his disciples, that they might have from the mouth of Christ a full and satisfactory answer, which would remove all their doubts and scruples, and attach them to Christ, now he was about to die, and leave them, than which nothing was more desirable to him. Though some have thought, that John's faith was somewhat slackened; and through his long imprisonment, he began to doubt whether he was the Messiah or not: and others have been of opinion, as particularly Dr. Lightfoot, that the reason of this message was, neither the ignorance and unbelief of John, or his disciples; but that John, with the rest of the Jews, having a notion of a temporal kingdom, and hearing of the mighty works of Christ, wonders that he himself was not delivered out of prison by him, grows impatient upon it, and asks, if he was the Messiah? And if he was, why did he suffer his forerunner and chief minister to lie in prison?
or do we look for another, to release me, and set up this kingdom?

Art thou he that should come? John the Baptist had predicted the coming One (Matthew 3:11). Perhaps John, impatient of the long delay, hoped to incite Jesus to proclaim his Messiahship.

He that is to come - The Messiah.