9. A number of our people have narrated from Sahl ibn Ziyad from Muhammad ibn ’Isma‘il who has said the following: “I once heard al-Rida’ , saying, ‘The endive is cure for a thousand illnesses. There is no illness in the belly of the sons of Adam that endives cannot dispel.’ He (the narrator) has said, ‘One day he asked for it because one of the servants suffered from fever and headache. He ordered to make it thin, spread it on a piece of paper then a certain amount of viola oil was poured on it and placed on his forehead. He (the Imam) then said, ‘This removes fever and is beneficial in headaches and to dispel it off.’”