Lubābu l-Muhassal fi Usul al-Din[1] (لباب المحصل في أصول الدين) is a book on Islamic theology by the scholar Ibn Khaldūn, written in around 1351 (752 AH).
Lubābu l-Muhassal is a commentary on Muhassal Afkar al-Mutaqaddimin wa al-Muta'akhkhirin, a work on theology by Fakhr al-Din al-Razi.
Khaldūn wrote the book under the supervision of his teacher al-Ābilī while living in Tunis, Tunisia.
[2] An English translation of Khaldūn's work, entitled Treatise in Logic, was published in 1952.
[5]: 8 The book is thought to be something of an exam paper or final project for his master, Al-Abili; the book testifies to Ibn Khaldūn's early grasp of the philosophical and theological material of the Takhlis al-Muhassal, a standard work of kalam.