Malachi 4:4-6

“Remember to obey the Law of Moses, my servant—all the decrees and regulations that I gave him on Mount Sinai for all Israel. “Look, I am sending you the prophet Elijah before the great and dreadful day of the LORD arrives. His preaching will turn the hearts of fathers to their children, and the hearts of children to their fathers. Otherwise I will come and strike the land with a curse.”