H 352 - Narrated to me a group of scholars from Abu Abdullah Muhammad bin Ahmad Sufwani that he said: Narrated to me Shaykh Husain bin Rauh:

Yahya bin Khalid administered twenty poisoned dates to Musa Ibn Ja’far and this led to the martyrdom of the Imam. The Messenger of Allah (s) and the Holy Imams did not pass away from the world, except through martyrdom by sword or poison; and it is narrated from Imam Ridha that he was poisoned; as well as his son and his grandson.