Ayyub b. ‘Umar narrated from Muhammad b. ‘Isa from Kamil from Muhammad b. Ibrahim al-Ju'fi who said: A man complained to Abu al-Hasan ul-Rida, peace be upon him, of gripes (al-maghs), the pains of which almost kiiled him. He asked him to pray to Allah, the Mighty and Sublime, for him, since the many medications he had taken for it had wearied him and had not benefited him. On the contrary, the severity [of the pain] had increased. He [Al-Ridha’] smiled and said: “Woe be to you, our prayer to Allah has weight, and I ask Allah to ease it for you with His Power and His Strength. When the affair [i.e. the pain] intensifies and you are in agony from it, take a walnut and throw it on the fire until you know that its kernel has been roasted and the fire has altered all of its shell. It [the pain] will subside at once.” He [the man] said: “By Allah, I only did that once and the gripes subsided, by the will of Allah, the Mighty and Sublime.”