Concept:The revealed books in Islam are the scriptures sent down by Allah to His prophets.
Explanation:The major revealed books include the Tawrah, the Zabur, the Injil, and the Qur'an.
The Tawrah was revealed to Prophet Musa, the Zabur to Prophet Dawud, the Injil to Prophet Isa, and the Qur'an to Prophet Muhammad.
Diwan is not a revealed book; it is a collection of Arabic poetry or poetic works.
Therefore, among the options given, Diwan is the one that is not a revealed book.
Answer:Diwan.