Sometimes it is assumed that there is no relation between the science of Usul Fiqh and Hadith but evidences shows another thing. Some scholars have written books in which hadiths utilized by Usul Fiqh are introduced. The book Usul of Ale Rasul is one of them. Utilizing the writings on the margins of Furu, al–Kafi, the author of this article tries to represent some parts of the above-mentioned book.