The Hadith of Archangel Gabriel
Try to imagine the situation. The Messenger of God, at the time the greatest human being on the face of the earth (as far as his companions were concerned - and the historical record bears them out), is sitting at the edge of an oasis in Medina with a group of his companions, that is, people who have accepted that he is the mouthpiece of God. Suddenly a man appears whom no one recognizes. This article titled, The Hadith of Archangel Gabriel, fully explains the faith of Islam and leaves no room for speculations.