The majority of Islamic commentators do not believe that Ali ibn Abi Talib is explicitly mentioned in the Quran.[citation needed] A notable exception is Ja'far Ibn al-Haytham who, in his Kitab al-Munazarat, points out that there are explicit uses of the words ʿAliyyan (Arabic: عَلِيًّا‎), ʿAliyyun (عَلِيٌّ), and ʿAlayya (عَلَيَّ) in the Quran which he believes are explicit references to Ali by name, modified according to Arabic grammatical rules.