Would like to know for instance our sunni brothers and sisters don't really follow the Imams. They only follow the Quran and the Prophet and the Sahaba. What about them for those who passed away? What happens about them. Do they get another chance and that will they be back at the reappearance of our Mawla?

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Yes when Imam comes he would offer all the chance, including non Muslims.

We have in the riwayat that many of the non Muslims would accept the Imam and many believers would reject him.