Undertaking the classic question of the relationship of Islam to Judaism, Geiger begins his treatment with the intertwined questions of what Islam wishes to do, is able to do, and is permitted to do with Judaism. Other related questions are also addressed, such as what Islam borrowed from Judaism. Geiger asks what was transformed in the Quran from that which originated in Judaic thought. Concepts and opinions such as faith beliefs, moral and legal regulations, and concepts of life are all considered as they moved from Judaism to Islam. Historical accounts such as those of Noah, Abraham, and Moses, also pass between the religions, as do the piety of Solomon and the denial of Judaism in the Quran. A well-regarded early work in the field of comparative religions, Geiger’s work is not to be missed by anyone with an interest in Judaism and its relationship to Islam.

Abraham Geiger (1810-1874) was a rabbi and scholar who played a major role in the founding of Reform Judaism. He studied at the Universities of Heidelberg and Bonn and was awarded a doctorate for this current work at the University of Marburg.