you truly have faith in God, or else bear the charge of wilfully doing wrong... Umar, I will not yield to your commands: I shall not pledge loyalty to him.' Ultimately Abu Bakr said, "O 'Ali! If you do not desire to give your bay'ah, I am not going to force you for the same. ʿAlī's wife and daughter of Muhammad, Fāṭimah, refused to pledge allegiance to Abū Bakr and remained angry with him until she died due to the issues of Fadak, the inheritance from her father, and the situation of ʿUmar at Fāṭimah's house; this is stated in various Sunnī ḥadīth collections, including Sahih al-Bukhari and Sahih Muslim. Fāṭimah never pledged allegiance to Abū Bakr; neither did she acknowledge or accept his claim to the caliphate. Almost all members of Banu Hashim, the Quraysh tribe to which Muhammad belonged, and many of his closest companions (the ṣaḥāba) had supported ʿAlī's cause after the death of Muhammad, whilst others supported Abū Bakr. It was not until the murder of the third rāshidūn caliph, ʿUthmān (657 CE), that the Muslims of Medina in desperation invited ʿAlī to become the fourth caliph as the last source, and he established his capital in Kufa (present-day Iraq). ʿAlī's rule over the early Muslim community was often contested, and wars were waged against him. As a result, he had to struggle to maintain his power against the groups who betrayed him after giving allegiance to his succession, or those who wished to take his position. This dispute eventually led to the First Fitna, which was the first major civil war between Muslims within the early Islamic empire. The First Fitna began as a series of revolts fought against ʿAlī, caused by the assassination of his political predecessor, ʿUthmān. While the rebels had previously affirmed the legitimacy of ʿAlī's khilafāʾ (caliphate), they later turned against ʿAlī and fought him. ʿAlī ruled from 656 CE to 661 CE, when he was assassinated while prostrating in prayer (sujud). ʿAlī's main rival, Muawiyah, then claimed the caliphate. The connection between the Indus Valley and Shīʿa Islam was established through the early Muslim conquests. According to Derryl N. Maclean, a link between the Sindh region and Shīʿas or proto-Shīʿas can be traced to Hakim ibn Jabalah al-Abdi, a companion of Muhammad, who traveled across the Sindh to Makran in the year 649 CE, and presented a report on the