Malachi 4:5

I will send; though the spirit of propheey cease for four hundred years, yet at the expiring of those years you shall have one sent, as great as Elijah, and therefore he is now called Elijah, that shall prepare Messiah's way. Elijah; not the same in person who reproved idolatrous Israel, who destroyed Baal, though both Jews and many Christians would gladly have it so, in favour of some errors they have adopted and would maintain. But this person here called Elijah was John Baptist, as is clear from Matthew 17:12 13, Elias is come, and they have done to him whatsoever they listed. Then the disciples understood that he spake of John the Baptist. And he was that Elias, if they would receive him, Matthew 11:14. Elias, was to come when Malachi lived; Elias was come, and the Jews had ill treated him, and Herod had beheaded him, when Christ here lived; this Elijah then was John the Baptist, who came in the spirit and power of Elias, Luke 1:17, and therefore bears his name in this prophecy. The prophet; who foretold Christ the true Messiah's sudden manifestation, who indeed was already among them, but had not yet diseovered himself; on whom he persuades the Jews to believe, and receive his person and his law, Luke 1:15 Mark 1:7,8; who was greater than a prophet, Matthew 11:9; nor doth John's denying himself to be a prophet, 1 Thessalonians 1:21, in their sense contradict this. Before; that is, immediately before; so he was born six months before Christ, and began his preaching but few years before Christ began to exercise his public office. Great: this day was great indeed, yet it is not the day of the last and great judgment, though the Jews perversely affirm it to evade the acknowledgment of Messiah's being already come. But this day of Messiah was great for the alterations he was to make in worship and church affairs, taking down the Mosaic ceremonies and enlarging the church; great for the miracles he wrought, and empowered others to do; great for the reconciliation between God and man, for the conquering of Satan, and casting him out of his throne. It was great too against the Jews his obstinate enemies. Dreadful: it was a time of vengeance executed upon a people whose sins were full ripe; and such sufferings fell on the Jews at that time, as may very well be an emblem of the day of judgment, and which may be remotely meant hereby. But the first, the literal and plain, meaning of the words refer to the times of vengeance upon the Jews from either the birth, or first preaching, or death of Christ to the final desolation of the city and temple, and irrecoverable overthrow of their government, of which Christ speaks at large, Mt 24 Mr 13; which places point out first the sad and dismal miseries of the Jews, and next, by accommodation, the end of the world and last judgment. Such a description of this day, Joel 2:31, by St. Peter interpreted and applied to this day of Christ, Acts 2:20, more fully clears this. The Lord; Jesus Christ, preaching to the Jews, calling them to repentance, reproving their sins, encouraging their compliance, threatening their impenitence, and labouting to gather the children of Jerusalem together under his wings, but they would not, Matthew 23:34; and therefore at last destroying by the Romans these obstinate and incorrigible sinners.