The Three Elijah's According To Scripture

In this study we are going to discover that the Elijah prophecy has a dual application, the first fulfillment happens just prior to the first coming of Jesus and the other before the second advent. Therefore, there are actually three Elijah’s mentioned in Scripture. Do I mean that Elijah is going to be reincarnated twice or literally return to the earth as himself? No. As we get into this study we are going to find out exactly what it is that I mean. So who are these three Elijah's?