V.1 But God is holy, and He tells us the end of the wicked. Punishment is on the way!
V.2 But! What a contrast for these people!
V.5-6 A man shall arise before the Lord comes in glory. Not for us there is no event to take place before He comes for us.
He will call the people to repentance before the great and terrible day of the Lord Jesus comes. Some will listen to him. So the Old Testament closes with the promise of the rising of the Sun of Righteousness, the Lord Jesus, coming in power. The New Testament closes with the promise of His coming as the Morning Star for us.