Harun ibn Ma'ruf, Abu al-Tahir, and Ahmad ibn Isa narrated to us; they said: Ibn Wahb narrated to us; 'Amr — meaning Ibn al-Harith — informed me, from 'Abd Rabbih ibn Sa'id, from Abu al-Zubayr, from Jabir, from the Messenger of Allah, peace and blessings be upon him, that he said: "For every disease there is a medicine, and when the medicine of the disease is found, it is cured by the permission of Allah, the Mighty and Majestic."