Al-Sayf al-Saqil fi al-Radd ala Ibn Zafil
Al-Sayf al-Saqil fi al-Radd 'ala Ibn Zafil, is a theological book, written by the Shafi'i-Ash'ari scholar Taqi al-Din al-Subki, as a refutation against Ibn al-Qayyim's poem entitled al-Kafiya al-Shafiya fi al-Intisar lil-Firqa al-Najiya, known popularly as al-Qasida al-Nuniyya.
Al-Subki considered the poem to be blasphemous due to its ideological practice of takfir, and due to its theological deviations about the Divine Attributes, i.e., anthropomorphism and anthropopathism.
Al-Subki purposely cited sections of the poem and also referred to Ibn Taymiyya. He strove to disqualify the derogatory designations used by Ibn al-Qayyim when he referred to the Ash'aris as Jahmiyya and Mu'attila, etc. Moreover, al-Subki explored several theological aspects concerning God's entity and His Attributes in terms of figurative interpretation and also deals with eschatological issues.
The book was re-edited and commented on by Hanafi-Maturidi scholar Muhammad Zahid al-Kawthari, under the title of Tabdid al-Zalam al-Mukhim min Nuniyyat Ibn al-Qayyim.
The Hanafi hadith scholar Murtada al-Zabidi — in the introduction to his book Ithaf al-Sada al-Muttaqin — quoted at some length from the refutation written by al-Subki.