Thematic Bible: The coming of the forerunner of the messiah

Remember ye the law of Moses my servant, - which I commanded him in Horeb, for all Israel, statutes and regulations. Lo! I am sending unto you Elijah the prophet, - before the coming of the great and awful day of Yahweh; And he shall bring back the heart of the fathers unto the children, and the heart of the children unto their fathers, - lest I come, and smite the land, with utter destruction.