5 Behold, I will send you Elijah the prophet before the great and terrible day of Yahweh comes.
6 He will turn the hearts of the fathers to the children, and the hearts of the children to their fathers, lest I come and strike the earth with a curse."
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Commentary on Malachi 4 Matthew Henry Commentary
Chapter 4
We have here proper instructions given us (very proper to close the canon of the Old Testament with),
Mal 4:1-3
The great and terrible day of the Lord is here prophesied of. This, like the pillar of cloud and fire, shall have a dark side turned towards the Egyptians that fight against God, and a bright side towards the faithful Israelites that follow him: The day cometh, that is, the Lord cometh, the day of the Lord; and it has reference both to the first and to the second coming of Jesus Christ; the day of both was fixed, and should answer the character here given of it.
Mal 4:4-6
This is doubtless intended for a solemn conclusion, not only of this prophecy, but of the canon of the Old Testament, and is a plain information that they were not to expect any more sayings nor writing by divine inspiration, any more of the dictates of the Spirit of prophecy, till the beginning of the gospel of the Messiah, which sets aside the Apocrypha as no part of holy writ, and which therefore the Jews never received.
Now that prophecy ceases, and is about to be sealed up, there are two things required of the people of God, that lived then:-