Abdullah Mohammad, on Dec 17 2007, 06:47 PM, said:
I have important questions about Jafari and Ismaili,
1. What are the main differences between Jafari and Ismaili?
2. Is it true that Jafaris follow a more legal and law based approach, while Ismailis are more mystical?
3. Do all Ismailis follow the Aga Khan?
4. What is Mustaali?
5. Is Mohammad BurhanUddin an Imam to the Mustaali?
The main, core difference is in the line of Imams we follow. The Imamis of course believe in the twelve holy Imams

, each one designated by their predecessor. The Ismailis on the other hand follow a different course. They go:
Imam `Ali

Imam Husayn

(they do not consider Imam Hasan

to be an Imam)
Imam `Ali ibn al-Husayn

Imam Muhammad ibn `Ali

Imam Ja`far ibn Muhammad
They then believe that Ismail ibn Ja`far (who died before his father) was the next Imam. This is a large topic, though rest assured that the rightful _designated_ Imam after Imam as-Sadiq

was in fact Imam Musa al-Kadhim

.
After `Ismail (about whom they've held different opinions regarding did he really die before his father or was it faked), they believe the next Imam was Muhammad ibn Ismail, whom they identify as the seventh Imam and the Qaim. After him, the Mustalis and Nizaris believe in a series of following Imams, starting they say with al-Wafi Ahmad ibn Muhammad, who were essentially underground and operating in secret (they have a list of names, but not much appears known about them). Then, a man called Said ibn Husayn, but referred to as ˤAbdullÄh al-MahdÄ« Billah rose up in North Africa, claiming descent from this line and leading to the foundation of the Fatimid dynasty in Egypt, with the suceeding rulers of which the Ismailis identify as their Imams. The history of Fatimids is a topic onto itself (during which time for instance you have the rule of al-Hakim bi Amrillah, who was likely insane and after whose assassination (possibly arranged by his sister) the Druze split off forming their own religion), but skip ahead to the death of Ma'ad al-Mustansir Billah, and this is where the Nizari/Musta`li split occurs. Nizar was al-Muntasir's oldest son, and likely designant, however the vizier, al-Malik al-Afdal, decided to put the child al-Mustali on the throne instead, and essentially rule behind him. Nizar was imprisoned, and his son may have fled to the fortress of Alamut.
The Mustali branch in turn eventually split away, claiming that Musta`li son and next Fatimid ruler, al-Amir, himself had a son who went into ghayba (known as at-Tayyib). From him, they believe there is a continous line of suceeding Imams, but they don't know who they are (each they say is in ghayba). In its place, they follow a line of Da`i al-Mutlaq, who rules over the community in stead of an Imam. This is who Burhan ad-Deen comes in, as Da`i of the Dawoodi Bohra branch of the Mustalis. There are whoever other lines of Da`is in rival Mustali sects that claim they are the true one instead (such as the Sulaymaniyyas).
The Nizari branch leads up to todays Agha Khanis. The details of their history is quite long, but a key event there is what was known as the Qiyamat. That is, they believe that in 1164, their then Imam, Hasan II, declared that the great resurrection had occured, and that they were no longer obliged to follow Islamic Shari`a. Skip ahead through the centuries to today, their so-called Imam is Karīm al-Hussainī. This current family is pretty well known for their rich European playboy lifestyles, drinking, partying, gambling, etc.
In terms of fiqh, obviously the Nizaris don't hold much in that way, interpreting much of the traditional obligations to be symbolic such as hajj meaning to visit their Imam, or replaced such as not saying the five salat but instead doing a du`a three times a day. Mind you, this symbolic re-interpretation doesn't seem to apply to paying their taxes, which are sent to their Agha Khan.
The Mustalis are more like the various madhahib in this sense, but obedience is very much centered around following their Da`i. I've been told my a former Bohra (who now is an Imami and who studied in Qum), that on average Bohras tend to be ignorant of their own religion, even knowing that the Da`i is a very corrupt man, but still continuing to identify as Dawoodi Bohras none the less.
Edited by macisaac, 18 December 2007 - 10:29 AM.