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Hujjat al-Islam (Arabic: حجة الإسلام, romanized: ḥujjat-u l-Islām, Persian: حجةالاسلام or حجتالاسلام, romanized: hojjat-o l-Eslām) is an Islamic honorific title meaning "authority on Islam" or "proof of Islam".
Its first recorded use was in a Sunni context, as a title for the 11th-century theologian al-Ghazali, due to his refutations of Hellenistic-influenced philosophers and Isma'ilis. It was later used as a term of respect for judges.
In the contemporary era, Egyptian Muhaddith Qadi Ahmad Shakir would confer the title "Hujjat al-Islam" to his master Muhammad Rashid Rida, upon his death. Deobandis granted this title to their leader Hanafi Maturidi theologian Muhammad Qasim Nanautavi for his debates with scholars of other religions and establishing Darul Uloom Deoband.
In Twelver Shia the title is awarded to scholars. It was originally applied as an honorific to leading scholars, but now the use indicates a status in the hierarchy of the learned below ayatollah.
Its earliest attested use for a Shia personage was during the Qajar period for Muhammad Baqir Shafti (d. 1843).