Malachi 4
1For, behold, the day cometh, it burneth as a furnace; and all the proud, and all that work wickedness, shall be stubble; and the day that cometh shall burn them up, saith Jehovah of hosts, that it shall leave them neither root nor branch. 2But unto you that fear my name shall the sun of righteousness arise with healing in its wings; and ye shall go forth, and gambol as calves of the stall. 3And ye shall tread down the wicked; for they shall be ashes under the soles of your feet in the day that I make, saith Jehovah of hosts. 4Remember ye the law of Moses my servant, which I commanded unto him in Horeb for all Israel, even statutes and ordinances.
5Behold, I will send you Elijah the prophet before the great and terrible day of Jehovah come. 6And he shall turn the heart of the fathers to the children, and the heart of the children to their fathers; lest I come and smite the earth with a curse.
What is Malachi 4 about?
The final word divides that coming day between the proud, who will be left as burning stubble, and those who fear God's name, for whom the Sun of righteousness will arise with healing in His wings. Malachi calls the people to remember the law of Moses His servant while they wait, and promises that God will send Elijah the prophet before the great and dreadful day of the LORD to turn the hearts of fathers and children toward one another. With that pledge the Old Testament falls silent, its last voice pointing past four centuries of waiting to the forerunner and to the dawn of salvation. So the Scriptures close as they had long moved—leaning forward, watching for the messenger of the covenant and the rising Sun who is Christ Himself.
Matthew Henry on Malachi 4