The status of the Koran during Muhammad's lifetime, and the Jewish and Christian influences on his Koranic predication. The collection of the Koran according to the Islamic sources. Distinction between "the Koran downhill" and "the Koran uphill". Critical hypotheses on the progressive constitution of the Koranic text. The Syro-Amaraic "lead" and the thesis of Christoph Luxenberg. The Koran could be partly the product of a group.Le statut du Coran à l'époque de Mahomet, et les influences juives et chrétiennes sur sa prédication coranique. La collecte du Coran selon les sources musulmanes. Distinction entre "le Coran en aval" et "le Coran en amont". Hypothèses critiques sur la constitution progressive du texte coranique. La piste syro-araméen...