Investigating the retreat in terms of existence and necessity

We collected this research by referring to different books including interpretive, narrative and narrators and expressed the content by reflecting on it. In this research, we first presented the lexical definition of return which means coming back and then described the terminological definition which means a great return after the advent. In the next step, we will prove the return whether it is possible or not? To answer this question, we will raise some reasons from the perspective of reason, the Quran, and narratives and then discuss the history of the return, that since when this discussion has been raised, and who have been its proponents and opponents, and how was each of the opponents responded. Then we will introduce the returning persons. we have named some of the Imams, as mentioned in the traditions and then, expressed the Sunni’ viewpoint. Here we will find that they do not know the definition and has not understood the return. Finally, we conclude the legitimacy of the return and the necessity of believing in it.