On Phlebotomy invites you into the world of medieval medicine through the practice of phlebotomy. This bilingual edition presents Maqāla fī l-Faṣd and its medieval Hebrew translation, Maʾamar baHaqqaza, attributed to the Persian physician Abū Bakr Muḥammad ibn Zakariyyāʾ al-Rāzī (d. 925). Divided into two parts, the volume provides a critical edition, English translation, and commentary for both works. It explores the art of phlebotomy together with broader aspects of care: diet, aftercare, and complementary treatments. Bridging disciplines and languages, this edition offers an accessible resource for historians of medicine, philologists, and curious readers alike.