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“When [the Mahdi] al-Qa'im appears, those, who have thought themselves as his followers, will apostatize and those, who are somehow like the worshippers of the sun and the moon, will believe in him.”
Mohammad Baqer Majlesi, Bihar al-Anwar, vol. 52 p.363; Bisharat al-Islam p.222; Mu'jam Ahadith Al-Imam al-Mahdi, compiled and written under 'Ali Kurani by Mu'assisa Ma'arif Islami, vol. 3 p.501