Malachi 4:4-6

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

5Behold, I will send you Elijah the prophet before the coming of the great and awesome2 Day of the LORD. 6And he will turn the hearts of the fathers to their children, and the hearts of the children to their fathers.3 Otherwise, I will come and strike the land with a curse.”