10 And his disciples asked him, saying, Why then say the scribes that Elias must first come?
11 And Jesus answered and said unto them, Elias truly shall first come, and restore all things.
12 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.
13 Then the disciples understood that he spake unto them of John the Baptist.
14 And when they were come to the multitude, there came to him a certain man, kneeling down to him, and saying,
15 Lord, have mercy on my son: for he is lunatick, and sore vexed: for ofttimes he falleth into the fire, and oft into the water.
16 And I brought him to thy disciples, and they could not cure him.
17 Then Jesus answered and said, O faithless and perverse generation, how long shall I be with you? how long shall I suffer you? bring him hither to me.
18 And Jesus rebuked the devil; and he departed out of him: and the child was cured from that very hour.
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It is not so easy to distinguish prophecy from prediction, and in response to the Lord Jesus Christ's words about the Resurrection, the disciples ask Him about Elijah's coming. After the disciples see Moses and Elijah speaking with Him at the Lord's Transfiguration, they remember Malachi's prophecy and ask the Lord Jesus their question. Perhaps the disciples understand the prophecy too literally. This is the first thing the Lord tells them, pointing out that this prophecy was fulfilled in John the Baptist, the prophet in the spirit and power of Elijah. This is how the disciples understand Christ, and this view was generally accepted in the apostolic age. Later interpreters, however, considered Christ's answer incorrect and began to insist that Elijah would come before the second coming, just as John came before the first.
But the main point in Christ's answer is something else. He shifts the conversation from what God was supposed to fulfill, and whether He fulfilled it, to how people receive His messengers. In modern terms, the problem is not whether God fulfilled Malachi's prophecy with enough precision, but that people did not recognize His messenger, did not receive his preaching, and killed him. The meaning of prophecy, then, is not literal fulfillment, but that we may become participants in the foretold work of God.