Reconstructs the formative debates concerning ritual purity in Islamic law and practice. Ritual purity is one of the least understood aspects of Islamic law and practice, yet it enjoys a prominent place in traditional legal texts and permeates the daily life of ordinary believers. Body of Text examines the emergence and crystallization of the law of ritual purity, using early sources to reconstruct the formative debates among Muslim scholars. The lively interaction among legal theorizing, caliphal politics, and popular practice illustrates the formation of the law, because as scholars strove for synthesis, they advanced competing understandings of the underlying structure and meaning of ritual purity. Katz demonstrates that no single theory can adequately interpret the diversity of opinion within the tradition.