The Book of Assaf is the earliest medical book written in Hebrew. According to the book it was written by Assaf (or Assaph) Ben Berhiyahu (son of Birhiyahu) and Johanan Ben Zabda, who lived in Israel between the fourth and sixth century CE. The book discusses illnesses, treatments and prevention. Some of the ideas are still used today, such as exercise, eating healthy food, and staying clean. The Book of Assaf includes Assaf's Oath[1], which in many aspects resembles the Hippocratic Oath. The Israeli hospital Assaf ha'rofe (Hebrew Assaf the Physician), is named after him. Excerpts from the book appear in a modern Hebrew edition by Suessman Muntner[1]