SEV Biblia, Chapter 17:12
Mas os digo que ya vino Elías, y no le conocieron; antes hicieron con l todo lo que quisieron; así tambin el Hijo del hombre padecer de ellos.
Clarke's Bible Commentary - Matthew 17:12
Verse 12. Knew him not] Or, ouk epignwsan auton, They have not acknowledged him. That is, the Jewish rulers have not acknowledged him, did not receive him as the forerunner of the Messiah. But it appears that all the rest acknowledged him as such; and some, from the power and demonstration of his preaching, were inclined to think he was more, even the Messiah himself: see Luke iii. 15.
John Gill's Bible Commentary
Ver. 12. But I say unto you , etc.] A way of speaking used by Christ, when he opposes and contradicts any of the tenets of the Scribes and Pharisees; (see Matthew 5:22,28,32,34,39,44) 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 oaths 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.
Matthew Henry Commentary
Verses 1-13 - Now the disciples beheld somewhat of Christ's glory, as of the onl begotten of the Father. It was intended to support their faith, when they would have to witness his crucifixion; and would give them an ide of the glory prepared for them, when changed by his power and made lik him. The apostles were overcome by the glorious sight. Peter though 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 upo earth. Whatever tabernacles we propose to make for ourselves in thi world, we must always remember to ask Christ's leave. That sacrific was not yet offered, without which the souls of sinful men could no have been saved; and important services were to be done by Peter an his brethren. While Peter spoke, a bright cloud overshadowed them, a emblem of the Divine presence and glory. Ever since man sinned, an heard God's voice in the garden, unusual appearances of God have bee terrible to man. They fell prostrate to the earth, till Jesu encouraged them; when looking round, they beheld only their Lord a they commonly saw him. We must pass through varied experiences in ou 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 comfor that he is with us.
Greek Textus Receptus
λεγω 3004 5719 V-PAI-1S δε 1161 CONJ υμιν 5213 P-2DP οτι 3754 CONJ ηλιας 2243 N-NSM ηδη 2235 ADV ηλθεν 2064 5627 V-2AAI-3S και 2532 CONJ ουκ 3756 PRT-N επεγνωσαν 1921 5627 V-2AAI-3P αυτον 846 P-ASM αλλ 235 CONJ εποιησαν 4160 5656 V-AAI-3P εν 1722 PREP αυτω 846 P-DSM οσα 3745 K-APN ηθελησαν 2309 5656 V-AAI-3P ουτως 3779 ADV και 2532 CONJ ο 3588 T-NSM υιος 5207 N-NSM του 3588 T-GSM ανθρωπου 444 N-GSM μελλει 3195 5719 V-PAI-3S πασχειν 3958 5721 V-PAN υπ 5259 PREP αυτων 846 P-GPM
Robertson's NT Word Studies
17:12 {Elijah is come already} (Eleias ede elqen). Thus Jesus identifies John the Baptist with the promise in Malachi, though not the real Elijah in person which John denied (#Joh 1:21). {They knew him not} (ouk epignwsan auton). Second aorist active indicative of epiginwskw, to recognize. Just as they do not know Jesus now (#Joh 1:26). They killed John as they will Jesus the Son of Man.