Tabsirat al-Adilla fi Usul al-Din: 'ala Tariqat al-Imam Abi Mansur al-Maturidi (Arabic: تبصرة الأدلة في أصول الدين على طريقة الإمام أبي منصور الماتريدي, lit.

'Exposition of the Proofs in the Basic Principles of Religion on the Basis of the Arguments of Imam Abu Mansur al-Maturidi's Teachings'), better known as Tabsirat al-Adilla (transl.

Instruction on Cogent Proofs),[3] is considered as the second most important kalam book of the Maturidite school, after Kitab al-Tawhid of al-Maturidi himself, composed by Abu al-Mu'in al-Nasafi.

The book is even more appreciated by the experts than “Kitab at-Tawhid” that it gives more perfect and detailed information about the main principles of the science of kalam.

It is probably because of this style that Nur al-Din al-Sabuni (d. 580 A.H. / 1184 A.D.), a later representative of Maturidite school, states that al-Nasafi's work was his main source.

And perhaps because of this fact that Abu al-Mu'in al-Nasafi was appreciated among the specialists in this field with the honourable title “Sahib at-Tabsira” (The author of Tabsira) and became famous among the experts of the science of kalam.

Because al-Nasafi admires al-Maturidi, he refers to his ideas several times, and he always supports his views against Mu'tazilite and Ash'arite thinking.

[4][5] In the second half of the 11th and the beginning of the 12th centuries when Abu al-Mu'in al-Nasafi lived, the science of kalam reached its peak of development.

Dealing with this matter it is noteworthy to mention the kind service provided by a researcher Claude Salama, who, in fact, performed a huge amount of work by comparing the four manuscripts of the book he had at his disposal and showing their merits and flaws.