Introduction

Abu Mu'in Maymun ibn Muhammad al-Nasafi al-Makhuli al-Samarqandi was born circa 438 AH and died in 508 AH in Samarqand. He was the foremost theologian of the Maturidi school in the generation following Abu al-Yusr al-Bazdawi, and his works shaped the systematic transmission of Maturidi kalam throughout the eastern lands of Islam and, subsequently, through the Ottoman scholarly tradition into the modern period. Al-Nasafi was a jurist of the Hanafi school who devoted the bulk of his scholarly energy to kalam, producing several works of varying scope — from the brief Bahr al-Kalam to the detailed Tabsirat al-Adillah. He studied within the scholarly networks of Transoxiana and represents the apex of the Samarqand school of theology, which traced its foundations directly to Abu Mansur al-Maturidi (d. 333 AH) himself.

Tabsirat al-Adillah fi Usul al-Din — The Illumination of the Proofs in the Foundations of Religion — is al-Nasafi's most comprehensive theological work, running to two substantial volumes in modern critical editions. It is organized around the full agenda of Maturidi kalam: the proofs for the existence of God, the divine attributes in their essential and active categories, the relation of God's will to human acts, the uncreated nature of the divine speech, the question of kashf and the rational capacity to know good and evil before revelation, prophethood and its confirmation through miracles, and the full range of eschatological topics. Al-Nasafi engages extensively with the Ash'ari school, noting agreements and carefully delineating disagreements, particularly on questions such as the scope of God's will, the definition of faith, and the rational knowability of ethical categories.

The scholarly significance of Tabsirat al-Adillah lies in its encyclopedic thoroughness and its role as the primary vehicle through which Maturidi positions were transmitted and elaborated in the post-classical tradition. Later Maturidi scholars, including the authors of the widely studied Sharh al-Maqasid and the commentators on the Nasafiyyah creed, drew on al-Nasafi's formulations extensively. The work also preserves valuable information about theological positions of schools that are otherwise poorly documented, including the Karramiyyah and various Mu'tazili subsects active in Khurasan and Transoxiana. For historians of Islamic theology, it is a primary source of the first order for understanding the diversity and richness of kalam in the fifth and sixth centuries of the hijra.

Students approaching Tabsirat al-Adillah should be aware that al-Nasafi writes within a tradition that takes the Maturidi-Ash'ari distinction seriously: he does not collapse the two schools into a single Sunni kalam but consistently marks where the Samarqand school takes a different position from the Basran school of the Ash'aris. Readers from both traditions will benefit from approaching these differences as matters of internal Sunni scholarly debate rather than sharp doctrinal ruptures. The work is best studied with a teacher or alongside explanatory material, as its arguments can be compressed. Within the Ahl us-Sunnah wal-Jama'ah, Maturidi theology has been the creedal school of the overwhelming majority of Hanafi Muslims throughout history, and Tabsirat al-Adillah remains its most thorough classical statement — indispensable for any serious engagement with the Maturidi intellectual heritage.