Scholars like Mr. Luxenberg and Gerd- R. Puin, who teaches at Saarland University in Germany, have returned to the earliest known copies of the Koran in order to grasp what it says about the document's origins and composition. Mr. Luxenberg explains these copies are written without vowels and diacritical dots that modern Arabic uses to make it clear what letter is intended. In the eighth and ninth centuries, more than a century after the death of Muhammad, Islamic commentators added diacritical marks to clear up the ambiguities of the text, giving precise meanings to passages based on what they considered to be their proper context. Mr. Luxenberg's radical theory is that many of the text's difficulties can be clarified when it is seen as closely related to Aramaic, the language group of most Middle Eastern Jews and Christians at the time.

For example, the famous passage about the virgins is based on the word hur, which is an adjective in the feminine plural meaning simply "white." Islamic tradition insists the term hur stands for "houri," which means virgin, but Mr. Luxenberg insists that this is a forced misreading of the text. In both ancient Aramaic and in at least one respected dictionary of early Arabic, hur means "white raisin."

Mr. Luxenberg has traced the passages dealing with paradise to a Christian text called Hymns of Paradise by a fourth-century author. Mr. Luxenberg said the word paradise was derived from the Aramaic word for garden and all the descriptions of paradise described it as a garden of flowing waters, abundant fruits and white raisins, a prized delicacy in the ancient Near East. In this context, white raisins, mentioned often as hur, Mr. Luxenberg said, makes more sense than a reward of sexual favors.