A groundbreaking study, this record introduces the virtually unknown story of Sufi influence on the development of Jewish mysticism. Illustrating that the Jewish religion was completely reconfigured due to sustained medieval contacts between Jewish and Muslim thinkers, this remarkable examination argues that the Islamic impact reverberates within Judaic traditions to this day. More than just a historical work, this exploration provides a fresh perspective on the social, religious, and political issues that have complicated Jewish-Muslim relations since the founding of Israel.