57 - Narrated to us Ali bin Ahmad bin Muhammad bin Imran al-Daqqaq رضي الله عنه: Narrated to us Hamza bin Qasim Alawi Abbasi: Narrated to us Ja’far bin Muhammad bin Malik Kufi Fazari: Narrated to us Muhammad bin Husain bin Zaid Zayyat: Narrated to us Muhammad bin Ziyad Azdi from Mufaddal bin Umar that he asked As-Sadiq Ja’far bin Muhammad عليه السلام regarding the words of Allah, the Mighty and Sublime: 
And when your Lord examined Ibrahim with some words, then he completed these. What were these words? He replied, “These were the words that Adam عليه السلام received from his Lord due to which Allah accepted his repentance. These words were as follows, ‘I ask You for the sake of Muhammad, Ali, Fatima, Hasan and Husain that You accept my repentance, so Allah accepted his repentance. Surely He is the Oft-turning, the Merciful.” 
I asked, ‘O son of Allah’s Messenger! What is the meaning of ‘he completed these’?’ He explained, “It implies that he completed the words till the Qaim, twelve Imams, of whom nine are the descendants of Husain عليه السلام.” 
Mufaddal requested, ‘O son of Allah’s Messenger! Please inform me about the saying of Allah, Mighty and Glorified be He: ‘And He made it as a lasting word in his posterity.’ He elaborated, “By this, He implies the Imamate. Allah, the High, has made it in the posterity of Husain till the Day of Judgment.” 
Again I inquired, ‘O son of Allah’s Messenger! How is it that the Imamate continued in the posterity of Husain and not in Hasan’s, although both are the sons of Allah’s Messenger, his grandsons and the chiefs of the youths of paradise?’ He clarified, “Certainly Musa and Harun were Prophets, Messengers and brothers but Allah, Mighty and Glorified be He, made Prophethood in the posterity of Harun and not in that of Musa عليه السلام and it does not befit anybody to question Allah’s action. Surely Imamate is the Caliphate of Allah in His earth and nobody can dispute His action as to why He has done so. For surely, Allah, Blessed and High be He, is Prudent in His actions. He is not questioned about what He does but the people will be questioned.”