Abu Dawud
Types Of Blood Wit
Book Number: 034 / Hadith Number: 4570
Narated By Some people : Abdul Aziz ibn Umar ibn Abdul Aziz said: Some people of the deputation which came to my father reported the Apostle of Allah (pbuh) 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.
Abd al-'Aziz said: Here physician does not refer to a man by qualification. It means opening a vein, incision and cauterization.