At the same time where the Muslims and the great companions...

At the same time where the Muslims and the great companions believed ‛Alī (a) to be the rightful khalīfa and the most knowledgeable person war was started between him and Mu‛āwīyah bin Abī Sufyān. Here, the belief in the Ahlul-Bayt (a) grew. The Ahlul-Bayt are glorified in the Qurān. Allah said that he removed all impurities from them and purified them a thorough purification. Allah also made it obligatory to love them and accept their authority.

A shi’a (follower) of the Ahlul-Bayt (a) is one who loves them, obeys them and believes in their rights. The Shia had a strong presence during the fight with Mu‛āwīyah and after Imām ‛Alī bin Abī Tālib's martyrdom when his son al-Hassan (also the son of the daughter of the prophet) became the khalīfa . After that a big argument arose between Imām al-Hussayn bin ‛Alī bin Abī Tālib (a) and Yazīd bin Mu‛āwīyah which lead to a war between them in a place called Karbalā', Iraq.

This war took place on the tenth day of the Islamic month ' Muharram ' in the 61stA.H.. Imām Hussayn and 78 of his companions and family members were martyred in this war. With all of this, there were not jurisprudential sects of Islam as there are today. There were two different sects at that time.

One of them followed the Ahlul-Bayt (a) those that Allah cleansed from all impurities and purified them a thorough purification, those who did not say anything except what their forefather, the messenger of Allah (s) said. The Ahlul al-Bayt (a) are none other than Imām ‛Alī, Hassan, Hussayn and the nine Imāms that came from his lineage (a). The other group followed the Umawī (Umayyad) judges. Of course amongst the Umawī judges there were different opinions and various verdicts.

At the end of the first century A.H. different jurists appeared and the Islamic sciences took form. Examples of these jurists are: Sa‛īd bin al-Mussayab, al-Hassan al-Basrī and Sufyān al-Thawrī who lived in the same time as Imām Muhammad al-Bāqir bin ‛Alī bin al-Hussayn bin ‛Alī bin Abī Tālib. The scholars of this time learned from him. Islamic jurisprudence started to spread out in the second century A.H.

Islamic jurisprudential sects also started to form because many jurists appeared and they made many religious verdicts which differed from the verdicts of others. Some of the differences include leaving the arms down in prayer or crossing them or in some of the rulings regarding wudū' , fasting, divorce, inheritance, etc.