Imam Ḥasan al-ʿAskari had informed about Mahdi Imam Hasan Askari (a.s.) informed Mūsa b. Ja’far Baghdadi, ‘It is as if I am seeing that you all are disputing about my successor. Beware! A Muslim may testify to all the Imams (a.s.) after the Holy Prophet (s.a.w.s.), but if he does not acknowledge my son’s Imamat, then he is just like that person who testifies to the prophethood of all prophets …