Iẓhār al-Ḥaqq, (also spelled as : Izhar-ul-Haq) is a book by Rahmatullah Kairanawi. Kairanwi had written this book in response to the allegations made by certain Christian missionaries against Islam and especially to counter the Mizan al-Haqq of Karl Gottlieb 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 Bengali. Christine Schirrmacher describes the book: 'The Demonstration of the Truth' (izhâr al-haqq) served as a summary of all possible charges against Christianity and was therefore used after al-Kairânawî's death as a sort of encyclopaedia since al-Kairânawî 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.

Urdu translation

Late Maulana Akbar Ali Khan of Darul Uloom Karachi translated the book into Urdu. Taqi Usmani wrote commentary to it. He also wrote a preface to the book which now comes as a separate book, What is Christianity? The translation and commentary have been published in three volumes.