Raj'at (return) constitutes one of the fundamental beliefs unanimously held by Imamiyyah scholars, referring to the return of a group of pure believers and pure disbelievers to this world on the eve of the appearance of Imam Mahdi (as). This belief has its roots in previous religions, and the Holy Qur'an reports numerous instances of the resurrection of the dead in this world. Despite solid Qur'anic and narrative evidence, some Islamic sects have denied it and raised doubts such as its similarity to reincarnation (tanāsukh), its contradiction with the verses negating return, and the weakness of narrative chains of transmission. Using a descriptive-analytical method and library sources, this article, while explaining the concept of Raj'at, examines and analyzes the Qur'anic and narrative evidence for it and responds to the doubts raised by opponents. The research findings show that at least six groups of Qur'anic verses indicate the occurrence of Raj'at in past nations, and verses such as «یوم نحشر من کل امة فوجاً» (The Day We will gather from every nation a crowd) explicitly refer to Raj'at in the end times. Furthermore, the traditions on Raj'at have reached the level of moral tawātur (successive transmission), and Shi'a scholars have emphasized the necessity of believing in it. A critical examination of the doubts also indicates that Raj'at is different from reincarnation and does not contradict the verses negating return due to its fundamental difference.