The Continuity of the Divine Testament Since the Time of Adam عليه السلام

Narrated to us my father; and Muhammad bin Hasan - May Allah be pleased with them - they said: Narrated to us Saad bin Abdullah; and Abdullah bin Ja’far, all of them from Muhammad bin Husain bin Abil Khattab from Ali bin Asbat from Abdullah bin Bukair from Amr bin Ashath that he said: I heard Aba Abdullah عليه السلام say: “You people think that we have discretion in the matter of Imamate and that we can appoint anyone we like as Imam. It is never so by Allah, it is the covenant of the Messenger of Allah صلى الله عليه وعلى آله وسلم to a person and after him to another till it reaches to its rightful owner.”