Malachi 4:5-6
5 Look! I will send my prophet Elijah to you. He will come before that great day of the Lord arrives. That will be a day that makes people afraid. 6 He will speak my message, so that fathers and their children return to each other as friends. Then I will not have to come and bring punishment on the land.’
4:5Elijah was a prophet who spoke God's message to the people. See 1 Kings 17:1. Here, God promises that another prophet like Elijah will come. See Matthew 17:10-13. 