Abul Hasanat Sayyid Abdullah Shah Naqshbandi Qadiri (Arabic: (Arabic: محدث دكن ابلحسنات سيد عبدالله شاه نقشبندى قادرى), popularly known as Hadrat Abdullah Shah Sahib, was a scholar of Islam and spiritual reformer. He is more particularly known as a muhaddith (one who specializes in Hadith literature), honorifically as Muhaddith-e Dakkan (the Muhaddith of the Dakkan). A prolific writer of Islamic sciences, he wrote extensively on fiqh (Islamic jurisprudence) and compiled his best-known work Zujajat al-Masabih in five volumes. A unique and comprehensive collection of Hadiths pertaining to the Hanafi school of law, the book is considered[by whom?] a magnum opus in hadith and fiqh literature. As a mufassir (Qur'anic exegite) and expounder of other Islamic religious texts, he is one of the most celebrated Sufis produced by India in the 20th century. He is popularly considered[by whom?] to be one of the saint-scholars among the masses of South India, particularly Hyderabad.