This work is an authoritative compilation of Islamic law based on the jurisprudence of the Shiite Imam, Ja`far al-Sadiq. In volume 1, the laws dealing with matters of worship (prayers, fasting, alms, hajj, etc…) are presented in concise, clear narrative. Volume 2 provides a summary of the laws dealing with civil (transactional) matters, generally known in Islamic law as, mu`amalat, which includes contract, inheritance, bequest, public trusts, marriage, and divorce laws. Together the two volumes provide Muslims and non-Muslims who are interested in learning about Islamic law (shari`ah) an account of formal legal opinions and rulings concerning nearly 3000 legal cases. Imam Ja`far al-Sadiq is the scholar who systematized Shiite jurisprudence followed by millions of Muslims around the world. He is seen as the founder of Imami (or Twelver or Ja`fari) Shiite school of jurisprudence. The Iranian constitution of 1980 enshrined this school of jurisprudence as the official source of law.