Malachi 4:4-6

4“1Remember the Law of Moses My servant, the statutes and ordinances which I commanded him in Horeb for all Israel.

5“Behold, I am going to send you 2Elijah the prophet before the coming of the great and terrible day of the Lord. 6He will 3turn the hearts of the fathers back to their children and the hearts of the children to their fathers, so that I will not come and 4strike the land with complete destruction.”