Matthew 17:13

It was a tradition of the Pharisees following the Prophet Malachi, that Elias should come before the coming of the Saviour, and bring back the heart of the fathers to the children, and the children to the fathers, and restore all things to their ancient state. The disciples then consider that this transformation which they had seen in the mount was His coming in glory, and therefore it is said, "And his disciples asked him, saying, How then say the Scribes that Elias must first come? As though they had said, If you have already come in glory, how is it that your forerunner appears not yet? And this they say chiefly because they see that Elias is departed again

The disciples knew not of the coming of Elias out of the Scriptures; but the Scribes made it known to them; and this report was current among the ignorant multitude, as was that concerning Christ. Yet the Scribes did not explain the coming of Christ and of Elias, as they ought to have done. For the Scriptures speak of two comings of Christ; that which has taken place, and that which is yet to be. But the Scribes, blinding the people, spake to them only of His second coming, and said, If this be the Christ, then should Elias have come before Him. Christ thus resolves the difficulty, He answered and said, "Elias truly shall come, and restore all things; but I say unto you, that Elias has already come." Think not that here is a contradiction in His speech, if He first say that Elias shall come, and then that he is come. For when He says that Elias shall come and restore all things, He speaks of Elias himself in his own proper person, who indeed shall restore all things, in that he shall correct the unbelief of the Jews, who shall then be to be found; and that is the turning the hearts of the fathers to the children, that is, the hearts of the Jews to the Apostles

Or; "He shall restore all things," that is those whom the persecution of Antichrist shall have overthrown; as He Himself should restore by His death those whore He ought.

But if there shall so much good arise out of the presence of Elias, why did He not send him at that time? We shall say, Because they then held Christ to be Elias, and yet believed not on Him. But they shall hereafter believe Elias, because when he shall come after so great expectation announcing Jesus, they will more readily receive what shall be taught by Him. But when He says that Elias is come already, He calls John the Baptist Elias from the resemblance of their ministry; for as Elias shall be the forerunner of His second coming, so was John the forerunner of His first. And He calls John Elias, to shew that His first coming was agreeable to the Old Testament, and to prophecy.

He then who at the Saviour's second coming should come in the truth of His body, come now in John in power and spirit. It followers, "And they knew him not, but did unto him whatsoever they would," that is, despised and beheaded him.

As he announced the Lord's coming, so he was also to foreshew His passion by the example of his own suffering and wrong; whence it follows, "So also shall the Son of Man suffer of them."

He takes the opportunity from the passion of John to refer to His own passion, thus giving them much comfort.

It is enquired how, seeing that Herod and Herodias were they that killed John, it can be said that Jesus also was crucified by them, when we read that He was put to death by the Scribes and Pharisees! It must be answered briefly, that the party of the Pharisees consented to the death of John, and that in the Lord's crucifixion Herod united his approval, when having mocked and set Him at nought, he sent Him back to Pilate, that he should crucify Him.

From the mention of His own passion which the Lord had often foretold to them, and from that of His forerunner, which they beheld already accomplished, the disciples perceived that John was set forth to them under the name of Elias; whence it follows; "Then understood the disciples that he spake to them of John the Baptist."

That He says of John, "Elias is already come," is not to be understood of the soul of Elias, that we fall not into the doctrine of metempsychosis, which is foreign to the truth of Church doctrine, but, as the Angel had foretold, he came "in the spirit and spirit of Elias."

On the other hand, he whose “heart” was habitually found “lifted up” rather than fattened up, who in forty days and as many nights maintained a fast above the power of human nature, while spiritual faith subministered strength (to his body), both saw with his eyes God’s glory, and heard with his ears God’s voice, and understood with his heart God’s law: while He taught him even then (by experience) that man liveth not upon bread alone, but upon every word of God; in that the People, though fatter than he, could not constantly contemplate even Moses himself, fed as he had been upon God, nor his leanness, sated as it had been with His glory! Deservedly, therefore, even while in the flesh, did the Lord show Himself to him, the colleague of His own fasts, no less than to Elijah. …

“ The disciples asked Him, saying, Why then say the scribes that Elijah must first come ?” The disciples indeed who went up with Jesus remembered the traditions of the scribes concerning Elijah, that before the advent of Christ, Elijah would come and prepare for Him the souls of those who were going to receive Him. But the vision in the mountain, at which Elijah appeared, did not seem to be in harmony with the things which were said, since to them it seemed that Elijah had not come before Jesus but after Him; wherefore, they say these things, thinking that the scribes lied. …

I have thought it necessary to dwell some time on the examination of the doctrine of transmigration, because of the suspicion of some who suppose that the soul under consideration was the same in Elijah and in John, being called in the former case Elijah, and in the second case John; and that, not apart from God, had he been called John, as is plain from the saying of the angel who appeared to Zacharias, “Fear not, Zacharias, for thy supplication is heard, and thy wife Elisabeth shall bear thee a son, and thou shalt call his name John;” and from the fact that Zacharias regained his speech after he had written in the tablet, that he who had been born should be called John. …

115. Matthew goes on thus: “And His disciples asked Him, saying, Why then say the scribes that Elias must first come? And Jesus answered and said unto them, Elias truly shall first come and restore all things. But I say unto you, that Elias is come already, and they knew him not, but have done unto him whatsoever they listed. Likewise shall also the Son of man suffer of them. Then the disciples understood that He spake unto them of John the Baptist.” This same passage is given also by Mark, who keeps also the same order; and although he exhibits some diversity of expression, he makes no departure from a truthful representation of the same sense. He has not, however, added the statement, that the disciples understood that the Lord had referred to John the Baptist in saying that Elias was come already.

5. They saw Him then lowly, and did not know Him. He was pointed out to them by a lamp. For in the first place he, than whom no greater had arisen of those born of women, said, “I am not the Christ.” It was said to him, “Art thou Elias? He answered, I am not.” For Christ sends Elias before Him: and he said, “I am not,” and occasioned a question for us. For it is to be feared lest men, insufficiently understanding, think that John contradicted what Christ said. For in a certain place, when the Lord Jesus Christ said certain things in the Gospel regarding Himself, His disciples answered Him: “How then say the scribes,” that is, those skilled in the law, “that Elias must first come?” And the Lord said, “Elias is already come, and they have done unto him what they listed;” and, if you wish to know, John the Baptist is he. …

“But I say unto you, that Elias is come already, and they knew him not, but have done unto him whatsoever they listed. Likewise shall also the Son of Man suffer of them. Then they understood that He spake to them of John.”

A Homily delivered on the Saturday before the Second Sunday in Lent, on the Transfiguration, S. Matt. xvii. 1-13