The Sunan, or "traditions," of Mohammed are now gathered in six books, though two of these are more specifically called the Sahihs, or "sincere books." These six works bear to Mohammedanism much the same relation as the Four Gospels do to Christianity. That is to say, they are the accounts of the prophet's life as handed down by his disciples. Of course to the Mohammedans the Sunan are not the main source of teaching. That is the Koran, which, as we have seen, is Mohammed's own book, dictated by the prophet himself. Moreover, the Sunan do not approach Mohammed with anything like the same accuracy and closeness with which the Gospels approach Jesus. The Sunan are slight and fragmentary traditions, gathered from every possible source at an interval of more than two centuries after their prophet's death. They have, however, been accepted as holy books or "canons" of the Mohammedan faith. Much of the Mohammedan religious law of to-day is founded on them; and they are taught in all the schools and made the basis of many a hair-splitting argument about right and wrong. Unlike the Christian religion, that of Mohammed sprang immediately into world-wide power; hence no sooner was the prophet dead than every companion of the revered teacher, every listener who had ever heard him speak, narrated to eager audiences each remembered trifle. Naturally these became exaggerated in the telling. Moreover, when rival caliphs fought and slew one another, each claiming rightful heirship from the prophet, their followers would inevitably invent traditions to justify each leader's claim. Exaggeration, if not direct falsehood, soon became inextricably mixed with fact. When, later on, men tried to set their faith upon a firmer basis, they sought to sift these manifold traditions and decide which were worthy of belief. The first man who set down these sifted traditions in a book was Al Bukhari. He traveled all over the Arab Empire to gather all the tales he could, and he continued elaborating on his book, the first Sahih, until his death in A.D. 870. Al Bukhari himself tells us that in his travels he gathered six hundred thousand tales about Mohammed. Of these he admitted to his Sahih, as being most trustworthy, a little over seven thousand. The second Sahih, written by a follower of Al Bukhari, was garnered from three hundred thousand tales.