ABSTRACT In this article, I argue that Abu Abdullah al-Muhajir and his book, ‘Issues in the jurisprudence of jihad’ (Masāʾil fī fiqh al-jihād), has likely been a major source of influence on the formation of the jurisprudential aspect of a new form of the Jihadi Salafi ideology which was epitomized by the practices of Abu Musab al-Zarqawi in the first place and of ISIS afterwards. I point out the similarities between al-Muhajir’s ideas and fatwas issued in his book and ISIS’s views and actions espoused and enacted later on in order to demonstrate how the book contributed to the making of the jurisprudential aspect of ISIS’s ideology. I pick three main themes, which I deemed to be representative of ISIS’s traits, to that purpose. The suicide attacks and civilian casualties that showed a dramatic rise after the invasion of Iraq in 2003 make up the first. The second one is the anti-Shia sentiment and attacks as they follow from it. The last one, maybe an ISIS signature among various intellectual lines and currents of Jihadi Salafism, consists of ‘savage’ or ‘brutal’ acts. Based on these three main themes, I aim to display the influence of al-Muhajir’s standpoints on ISIS’s ideology.
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