Apostasy in Islam (Arabic: ردة‎, riddah or ارتداد, irtidād, an apostate from Islam is a murtad (Arabic: مرتد‎) is commonly defined as the abandonment of Islam by a Muslim, in word or through deed. It includes not only explicit renunciations of the Islamic faith by converting to another religion (or abandoning religion altogether), but also blasphemy or heresy, through any action or utterance implying unbelief, including those denying a "fundamental tenet or creed" of Islam.