Narrated 'Amr b. Suh'aib: On his father's authority, said that his grandfather reported the Messenger of Allah (ﷺ) said: Anyone who practises medicine when he is not known as a practitioner will be held responsible. Abu Dawud said: This has been transmitted by al-Walid alone. We do not know whether it is sound or not

English translation · Sunan Abu Dawud