One of the central concepts in rabbinic Judaism is the notion of the Evil Inclination, which appears to be related to similar concepts in ancient Christianity and the wider late antique world. The precise origins and understanding of the idea, however, are unknown. This volume traces the development of this concept historically in Judaism and assesses its impact on emerging Christian thought concerning the origins of sin. The chapters, which cover a wide range of sources including the Bible, the Ancient Versions, Qumran, Pseudepigrapha and Apocrypha, the Targums, and rabbinic and patristic literature, advance our understanding of the intellectual exchange between Jews and Christians in classical Antiquity, as well as the intercultural exchange between these communities and the societies in which they were situated.