Al-Jwab al-Sahih Laman Badal Din al-Masyah 5 Majaladat - Ibn Taymiyyah - Tasyl (el-Cevâbü's-Sahîh li-men Beddele Dîne'l-Mesîh 5 Mücelledât - İbn Teymiyye - Te'sîl)

A foundational Hadith collection and Islamic study presenting verified prophetic traditions and legal rulings.
(One of the greatest works refuting Christianity, by Shaykh al-Islam Ibn Taymiyyah (d. 728 AH), written in answer to a letter from the Christians of Cyprus, discussing the doctrines of trinity, incarnation and union and the alteration of scriptures, and proving the prophethood of Muhammad ﷺ with rational and textual evidence.

An essential reference in comparative religion. In five volumes.)