The epistle ascribed to Salim Ibn Dhakwan, and written sometime before AD 800, was discovered in the early 1970s by the scholar, Amr Khalifa Ennami, who brought a xerox of the now lost manuscript to the attention of Islamic scholars. Edited, translated, and discussed here in full for the first time, the epistle is an early Islamic tract against "wrong" doctrines regarding the classification and treatment of opponents.