Da'a'im al-Islam

Da'a'im al-Islam was written to govern a state, not only a congregation. Al-Qadi al-Numan compiled it in the tenth century CE while serving as chief judge under the Fatimid Caliphate, the Ismaili Shia dynasty that ruled Egypt and, at its height, much of North Africa and parts of the Levant from its capital in Cairo, and the book was adopted as the empire's official legal reference. It is organized in two volumes, one covering acts of worship, ritual purity, prayer, fasting and pilgrimage, the other covering social transactions, marriage, inheritance, commerce and criminal law, a structure familiar from Sunni legal manuals of the period.

What sets it apart is its chain of authority: where Sunni hadith collections trace rulings back through a wide circle of the Prophet's companions, and Twelver Shia collections trace them through a line of twelve Imams, Da'a'im al-Islam traces its hadith specifically through Ali and the line of Ismaili Imams descended from him, reflecting the Fatimid state's own claim to legitimate religious and political authority resting in that line. Al-Numan held the position of chief qadi under three successive Fatimid caliphs and wrote extensively beyond Da'a'im al-Islam itself, but it was this two-volume code, rather than his other juristic and polemical writing, that the state adopted as its working legal reference.

The Fatimid Caliphate fell in 1171 CE, but Da'a'im al-Islam did not fall with it. The text passed into the keeping of the Tayyibi branch of Ismailism, which had already separated from the mainline Fatimid da'wa earlier in the twelfth century over a disputed succession, and it survived there as an active legal reference rather than a historical curiosity.

The Dawoodi Bohra community, the largest surviving Tayyibi Ismaili group, concentrated historically in western India and Yemen, continues to treat Da'a'im al-Islam as authoritative under the guidance of its Da'i al-Mutlaq, the community's senior religious leader, applying it to questions of ritual practice and personal law within the community today. This continued use sets Da'a'im al-Islam apart from the broader legal and doctrinal development of the Nizari Ismaili branch associated with the Aga Khan, which followed a different institutional and doctrinal path after its own split from the Fatimid line in 1094 CE and does not draw on the text in the same direct, applied way the Tayyibi Bohra tradition does. The text also circulated to a lesser extent among Nizari Ismaili communities in earlier centuries before their own doctrinal development diverged further, though it is the Tayyibi and Dawoodi Bohra line that has preserved it as an actively applied legal reference into the present day.