The Muslim accusation of the corruption or deliberate falsification of pre-Qur'ānic scriptures has been a major component of interfaith polemic for a millenium or more. The accusation has frequently sought attestation from a series of "tampering" verses in the Qur'ān. Investigation of the interpretation of these verses in the earliest commentaries on the Qur'ān, however, reveals a discrepancy between the confident polemical accusation and the tentative understandings of the first Muslims. Of greater interest to early commentators was a story of deception and obstinacy by the...