Qur`an (also Koran, Quran, Coran) Holy book of the Moslems revealed by Allah to Mohammed through Jibril (Gabriel). For Moslems it was written in Heaven by none other than Allah (dictating a self writing pen) in perfect Arabic, from immemorial time. The Qur`an is a manual of proselyting Islam through all means, as the belief in Allah justifies them all.