The Causes of Difference in Versions of an Early Imamiyyah's Hadith Book

One of the characteristics of the Islamic hadith, especially the Imamiyyah hadith, is its transmission based on writing. This feature has also caused problems, although it is one of the advantages of Islamic hadith. One of this problems is the difference in the versions of this hadith books In this research, we try to identify the causes of difference between different versions of the early Imamiyyah's books based on historical and hadith reasons, and provide suitable examples for each case. As a result of this discussion, four general factors were found: Forgery, Inadvertent distortion, The narrator's opinion, and hasten to publication.