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Narrated Some people: AbdulAziz ibn Umar ibn AbdulAziz said: Some people of the deputation which came to my father reported the Apostle of Allah (peace_be_upon_him) 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. AbdulAziz said: Here physician does not refer to a man by qualification. it means opening a vein, incision and cauterisation.