he heard Imam abu ‘Abdallah (a.s.) saying, “I testify that Amir al-Mu’minin (a.s.) is the Imam obedience to whom is obligatory by the command of Allah, that al-Hassan (a.s.) is the Imam obedience to whom is obligatory by the command of Allah, that al-Husayn is the Imam obedience to whom is obligatory by the command of Allah, that Ali ibn al-Husayn is the Imam obedience to whom is obligatory by the command of Allah and that Muhammad ibn Ali is the Imam obedience to whom is obligatory by the command of Allah.”