M.A. Thesis:

Investigating the jurisprudential foundamentals of Takfir and its dangers for Islamic society.

The subject of this study,is the "Review of jurisprudential principles of ''excommunication '' and its risks for the Muslim community. excommunication is one of the currents that located against the Islamic Ummah and Accused Muslims to disbelief and polytheism and consider muslim 's acts same unbelievers . The aim of this study is to identify and introduction of the malicious thoughts that follow them, including Islamophobia, presenting a false image of Islam, insulting Islamic sanctities,and Identify the person as a polytheist who adheres to Islam. So it is necessary to understand this process and also introduce it to others so that we can take steps to weaken and destroy this evil cult. Researcher in this study for collect the contents uses the library method and different books.it is concluded that the background of excommunication turns to early Islam and only by further revival of Islam we can deal with them. now there are also groups such as ISIS and Taliban. ISIS is an acronym for the Islamic State of of Iraq and Syria and as a Islam,has diverted many people and kill the Muslims. one of the most important ways to deal with this process, is formation of centers for Wahhabism and Salafi studies.

Keywords: heresy, excommunication, apostasy, unity, apostate