International audienceIn this paper which is based above all on ancient Arabic-Islamic sources, the hypothesis is expressed that passages of the Meccan Koran could have been originally the production of a group (German : Gemeindeprodukt). The themes which are discussed here are, among others : the topos " Saint ! Saint " attributed to Waraqa b. Nawfal or others ; the problem of Mohammed's " informantss " de Mahomet ; the case of Zayd b. Thabit, one of Muhammed's secretary and one of the redactors of the so-called " Othmanian " Koran ; the missing of forgotten verses ; the ambiguity in Arabic of the vocabulary on memorization, collection, composition and redaction of the Koran ; the Koranic language and the Arabic writing ; the original Mecc...