Izhar ul-Haqq or Izhar al-Haq (Arabic: إظهار الحق) is a book by Rahmatullah Kairanawi.
Kairanawi had written this book in response to the allegations made by certain Christian missionaries against Islam and especially to counter Meezanul Haqq, a book written by Pfander against Islam. The book was originally written in Arabic in 1864, this six-volume book was later translated (or summarized) into English, Turkish, Urdu and Bangla.
Christine Schirrmacher describes the book saying:
‘The Demonstration of the Truth’ (izhâr al-haqq) served as a summary of all possible charges against Christianity and was therefore used after Kairanawi’s death as a sort of encyclopedia since Kairanawi extended the material of former polemicists like ‘Ali Tabarî, Ibn Hazm or Ibn Taymiyya to a great extent.
Sources:
Kairanawi made use of Western Biblical criticism as well as theological works.