Imam Ja'far Sadiq (a.s.) had passed away, after being poisoned: but at that time, Abu Baseer had not been in town.  So he had come now to offer his condolences.  He wept bitterly as he remembered the Imam (a.s.).

        Umm Hamidah said:
        "Abu Baseer, you were not here when the Imam was breathing his last.  A strange thing happened."
        Abu Baseer inquired: "What happened?"
        Umm Hamidah said:
        "Just as the Imam was breathing his last, he seemed to suddenly to recover.  Raising his eyes, he asked us to call all the members of the family to his bedside.  Everyone of the family was there, waiting to hear what the Imam had to say.  And then, addressing us all, the Imam said:
        'Our Shafa'at (Intercession on the Day of Judgment) shall not reach those who belittle the importance of salat (namaz).  With the final words, he departed."
 

Reference:
Pearls of Wisdom.  A String of Incidents in the History of Islam.  The World Federation of Khoja Shia Ithna-Asheri Muslim Communities. Page 68.