Book

Daʿāʾim al-Islām wa dhikr al-ḥalāl wa l-ḥarām wa l-qaḍāyā wa l-aḥkām ʿan Ahl Bayt Rasūl Allāh ʿalayh wa ʿalayhim afḍal al-salām (Arabic: دعائم الاسلام و ذکر الحلال و الحرام والقضایا و الأحکام عن أهل بیت رسول الله علیه و علیهم أفضل السلام) is a book concerning religious beliefs and the rulings of shari'a on the basis of Isma'ili jurisprudence. It is the most important book written by Qadi Nu'man regarding jurisprudence, which was written at the request of the Fatimid caliph, al-Mu'izz li Din Allah. The book contains all standard sections of jurisprudence. Moreover, it opens with a section called "kitab al-wilaya", in which the author deals with most important Isma'ili beliefs, such as iman (faith) and its difference from Islam, wilaya of Ahl al-Bayt (a), and the significance of learning Islamic disciplines.The book is very significant for Isma'iliyya. Some Twelver scholars have also appealed to the book in their ijtihad.