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Abū ʿAbd al-Raḥmān Abd Allah ibn al-Mubarak was an 8th-century traditionalist Sunni Muslim scholar and Hanafi jurist. Known by the title Amir al-Mu'minin fi al-Hadith, he is considered a pious Muslim known for his memory and zeal for knowledge who was a muhaddith and was remembered for his asceticism.
Islamic hadith scholar and jurist (726–797) · From Wikipedia