Narrated Abdul Aziz ibn Umar ibn Abdul Aziz: Some people of the deputation which came to my father reported the Messenger of Allah صلی اللہ علیہ وسلم as saying: Any physician who practises medicine when he was not known as a practitioner before that and he harms (the patients) he will be held responsible. Abdul Aziz said: Here physician does not refer to a man by qualification. it means opening a vein, incision and cauterisation.