Some people of the deputation which came to my father reported the Messenger of Allah (ﷺ) 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.
Reference: Sunan Abi Dawud 4587 In-book : Book 41, Hadith 94 English translation : Book 40, Hadith 4570
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