Explanation and investigation of the jurisprudential reasons for excommunication thought and its effects

The Takfir thought has been able to reestablish itself many times through the use of two major Islamic sources ,the Quran and the Sunnah ,as well as citing some differences of jurists throughout history and imposed a great deal of damage on corpus of Islamic society . So it was appropriate to explain its intellectual foundations and exposed to public opinion .this research examined the historical background of Takfir thought and evaluated its major jurisprudential foundations from religious texts (more in Sunnah) as well as the objective debris of this stream of thought and proved that none of its jurisprudential auxiliaries were capable of proving the religious legitimacy of this process and its consequences.