The Chief of Justice Abu Abdillah Husain bin Harun Al-Z’ubbi narrated from Ahmad bin Mohammad, from Ali bin Hasan, from his father, FROM ALI BIN MUSA AL-REDHA (ASWS) (8TH IMAM), FROM HIS FATHER, FROM JAAFAR BIN MOHAMMAD (ASWS), FROM HIS FATHER (ASWS), FROM ALI BIN HUSAIN (ASWS), FROM HIS FATHER (ASWS) WHO SAID,
The MESSENGER OF ALLAH (SWT) said, “There will be a dark conspiracy after me. The only survivors will be ‘those who hold on to the firmest handle' (2:256).”
So the people asked the PROPHET (SAWW), “What is the firmest handle?”
The Prophet replied, “The Wilayat of the Master of the Successors.”
They asked the Prophet, “Who is the Master of the Successors?”
The Prophet replied, “The COMMANDER OF THE BELIEVERS (ASWS).”
They asked the Prophet, “Who is the COMMANDER OF THE BELIEVERS (ASWS)?”
The Prophet replied, “The Master of Muslims and their Imam after me.”
They asked the Prophet, “Who is the Master of Muslims and their Imam after you?”
The Prophet replied, “My brother, ALI BIN ABI TALEB (ASWS).”
(Ref :Bihar Al-Anwar V36 P20 H16. )