Abul A'la Maududi
Takfir has become "a central ideology of militant groups" such as those in Egypt, "which reflect the ideas" of Sayyid Qutb, Abul A'la Maududi and others, according to the Oxford Islamic Studies Online website. It is rejected by Islamic scholars and leaders such as Hasan al-Hudaybi (d. 1977) and Yusuf al-Qaradawi and by mainstream Muslims and Islamist groups.