17:1-13 Now the disciples beheld somewhat of Christ's glory, as of the only begotten of the Father. It was intended to support their faith, when they would have to witness his crucifixion; and would give them an idea of the glory prepared for them, when changed by his power and made like him. The apostles were overcome by the glorious sight. Peter thought that it was most desirable to continue there, and to go no more down to meet the sufferings of which he was so unwilling to hear. In this he knew not what he said. We are wrong, if we look for a heaven here upon earth. Whatever tabernacles we propose to make for ourselves in this world, we must always remember to ask Christ's leave. That sacrifice was not yet offered, without which the souls of sinful men could not have been saved; and important services were to be done by Peter and his brethren. While Peter spoke, a bright cloud overshadowed them, an emblem of the Divine presence and glory. Ever since man sinned, and heard God's voice in the garden, unusual appearances of God have been terrible to man. They fell prostrate to the earth, till Jesus encouraged them; when looking round, they beheld only their Lord as they commonly saw him. We must pass through varied experiences in our way to glory; and when we return to the world after an ordinance, it must be our care to take Christ with us, and then it may be our comfort that he is with us.

Verse 12. - Elias is come already. The mystical, not the real, Elias, even John the Baptist, who came in the spirit and power of Elias (Luke 1:17). Christ is here speaking of the past, as in the preceding verse he spake of the future. The common Jewish interpretation confused the two events and the two personages, reducing them to one. And this mistake has been committed by many modern expositors. They knew him not. They did not recognize his true character and the import of his mission. Though they gathered round him and listened to his preaching and denunciations, very few saw in him the precursor of the Messiah, and many, misunderstanding his austere, self-denying life, deemed him to be possessed by a devil (Matthew 11:18). They have done unto him. John suffered a long imprisonment, and was eventually murdered; and though Herod was primarily answerable for these doings, the people were virtually guilty, in that they consented to the injurious treatment and made no effort in his favour. Likewise...also. Taking occasion from the mention of the Baptist's fate, Jesus foretells his own sufferings and death, endeavouring to make the apostles familiar with the idea of a dying as well as a conquering Messiah.

But I say unto you,.... A way of speaking used by Christ, when he opposes and contradicts any of the tenets of the Scribes and Pharisees; see Matthew 5:22 "that Elias is come already"; the person that was signified by, and prophesied of, under the name of Elias: for Christ refers not to the late appearance of Elias on the mount, but to the coming of a certain person some time ago; who came in the power and spirit of Elias, and was the forerunner and harbinger of him, the Messiah; as was said of him he should, "and they knew him not"; that is, the Scribes and Pharisees, who believed that Elias would come before the Messiah; and yet when he who was designed by him was come, they knew him not, they did not know him to be the Elias; they knew him under the name of John the Baptist, and seemed pleased with his ministry for a while, but afterwards rejected his doctrine and baptism, which is referred to in the next clause:

but have done unto him whatsoever they listed; they did not believe what he said, nor repent upon his preaching to them; they rejected the counsel of God he declared, not being baptized of him; they treated him with indignity and contempt, charging him with having a devil, and were well pleased when Herod put him to death; some of whom were doubtless among those that sat at meat with him; for whose sake, as well as for his oath's sake, he ordered the execrable murder to be committed:

likewise also shall the son of man suffer of them. Christ takes this opportunity to confirm what he had said in the preceding chapter, concerning his sufferings and death; and his meaning is, that as sure as John the Baptist had suffered indignities, and death itself, so sure should the son of man suffer like things; if not from the same individual persons, yet from that generation of men.

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