Among Muslims today, the idea that the text of the Bible has been falsified has long been a part of common belief. It is assumed that the Old as well as the New Testament originally were genuine revelations from God, but that in the course of time they were altered and distorted by human beings. Among Muslim non-theologians, there prevails only a vague knowledge about how these changes were undertaken and to which Biblical statements they are supposed to apply. Muslim theologians, on the other hand, attempt to corroborate the Islamic dogma of the falsification of the Biblical texts with arguments from the historical-critical exegesis of the Bible as practiced by Christian theologians.