The Shia or “party” of Ali, already in existence during the lifetime of the Prophet, maintained that while the revelation ceased at the Prophet’s death, the need for spiritual and moral guidance of the community, through an ongoing interpretation of the Islamic message, continued. They firmly believed that the legacy of Prophet Muhammad could only be entrusted to a member of his own family, in whom the Prophet had invested his authority through designation. That person was Ali, Prophet Muhammad’s cousin, the husband of his daughter and only surviving child, Fatima, and his first supporter who had devoutly championed the cause of Islam and had earned the Prophet’s trust and admiration. Their espousal of the right of Ali and that of his descendants, through Fatima, to the leadership of the community was rooted, above all, in their understanding of the Quran and its concept of qualified and rightly guided leadership, as reinforced by Prophetic traditions. The most prominent among the latter were part of the Prophet’s sermon at a place called Ghadir Khumm, following his farewell pilgrimage, designating Ali as his successor, and his testament that he was leaving behind him “the two weighty things”, namely the Quran and his progeny, for the future guidance of his community.