Sources for Biography of Muhammad-Coran, and Tradition: Muir-1861

We have two main treasuries from which may be drawn materials for tracing the life of Mahomet and the first rise of Islam. These are the CORAN, and the TRADITIONS of the two first centuries. Two minor classes may be added, namely, contemporary documents, and Arab poetry; but these have been, for the most part, transmitted by Tradition, and may with propriety be treated as coming under the same head.