“Knowledge acquired through truthful reports (khabar sadiq) is also divisible into similar categories: (1) reports that establish knowledge necessarily (daruri) due to their self-evident veracity, and (2) reports that establish knowledge through evidence-based deduction (istidlali), such as those reports transmitted by prophets whose prophethood is corroborated by miracles. Knowledge in this category includes divine revelation (wahy) and is the sole source of knowledge available to humans which provides insight into the empirically and rationally inaccessible, i.e. the unseen (ghayb). Reliable and unadulterated reports of revelation are accesible today in two forms: (1) the Qur'an, or recited revelation (wahy matluww), and (2) the Hadith (prophetic tradition), or non-recited revelation (wahy ghayr matluww).”
— Keshavarzi, Fahad, Ali and Awaad. (2021). Applying Islamic Principles to Clinical Mental Health Care.