Abu Dawud
Types Of Blood Wit
Book Number: 034 / Hadith Number: 4569
Narated By Abdullah ibn Amr ibn al-'As : The Apostle of Allah (pbuh) 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