Ibn Taymiyah, Al-Jawāb al-Ṣaḥīḥ li-man baddala dīn al-Masīh (Literally, "The Correct Response to those who have Corrupted the Deen (Religion) of the Messiah"; A Muslim theologian's response to Christianity) – Seven Volumes. In modern critical editions it amounts to more than 2000 pages.