God's judgment on the wicked,
Malachi 4:1 For behold the day shall come kindled as a furnace: and all the proud, and all that do wickedly shall be stubble: and the day that cometh shall set them on fire, saith the Lord of hosts, it shall not leave them root, nor branch.
and his blessing on the good.
Malachi 4:2 But unto you that fear my name, the Sun of justice shall arise, and health in his wings: and you shall go forth, and shall leap like calves of the herd. Malachi 4:3 And you shall tread down the wicked when they shall be ashes under the sole of your feet in the day that I do this, saith the Lord of hosts.
He exhorteth to the study of the Law,
Malachi 4:4 Remember the law of Moses my servant, which I commanded him in Horeb for all Israel, the precepts, and judgments.
and telleth of Elijah's coming and office.
Malachi 4:5 Behold, I will send you Elias the prophet, before the coming of the great and dreadful day of the Lord. Malachi 4:6 And he shall turn the heart of the fathers to the children, and the heart of the children to their fathers: lest I come, and strike the earth with anathema.