يوحنا الدمشقي
In 746 John of Damascus (sometimes St. John of Damascus) wrote the "Fount of Knowledge" part two of which is entitled "Heresies in Epitome: How They Began and Whence They Drew Their Origin". In this work St. John makes extensive reference to the Quran and, in St. Johns's opinion, its failure to live up to even the most basic scrutiny. The work is not exclusively concerned with the "Ismaelites" (a name for the Muslims as they claimed to have descended from Ismael) but all heresy. The "Fount of Knowledge" references several suras directly often with apparent incredulity.