Commonly known as Data Sahib in Pakistan and the rest of the subcontinent, ‘Ali b. ‘Uthman al-Jullábí al-Hujwírí (d. 1072 A.D., buried in Lahore, where he spent much of his life), was a prominent Sufi master and scholar, best known for his influential work Kashf al-Mahjúb (The Revelation of the Veiled), one of the earliest and most significant texts on Sufism. It provides a comprehensive introduction to Sufi doctrine, practices, and terminology, and remains a foundational text for understanding classical Islamic mysticism. Reflecting the deep spiritual insight and clarity of expression of its author, Kashf al-Mahjúb emphasizes the importance of both inner experience and outward religious observance in the Sufi path. It has greatly contributed to the understanding of the Sufism and its development, making it one of the most important books in the early Islamic Sufi tradition.