Shaykh Abdul Fattah Abu Ghudda's classic collection regarding manahij of hadith scholars. This consists of three risalahs: رسالة أبي داود إلى أهل مكة - which gives important background information regarding Sunan Abi Dawud, and شروط الإئمة الخمسة and شروط الأئمة الستة which speak about the 6 hadith books and the authors' intent therein. Publisher دار البشائر