Written sources, methods of tolerance and multiple role of narrators in validating Imami hadiths

Many believe that for centuries, the memory of the narrators has been the repository for the preservation of Imami hadiths, and languages ​​have been the means of their transmission and dissemination; But historical evidence shows that written works have taken on the important task of preserving and transmitting this hadith heritage. The narrators, in order to preserve the works and at the request of the Taliban, provided them to other narrators. Transferring sources for a variety of reasons, such as ensuring that newer versions matched the original text, required listening and reading. Over time, other methods of hadith tolerance were added to these two methods.Most narrators cite the names of the narrators of the sources, their authors, and the narrators in the source at the beginning of the hadiths taken from previous works. The various maps of individuals in the transmission of hadiths require that in the validation of news, attention be paid to the type of map-making.Examining the causes of the emergence of hadith tolerance methods and the historical course of the changes that have taken place in this process, shows that in validating the hadiths based on the various maps of each of the planners in the transmission of news, they should be evaluated differently.