4:1 (3:19) “For indeed the day is coming, burning like a furnace, and all the arrogant evildoers will be chaff. The coming day will burn them up,” says the Lord who rules over all. “It will not leave even a root or branch.
Malachi 4:5
4:5 Look, I will send you Elijah the prophet before the great and terrible day of the Lord arrives.