made at the event remain open to interpretation. In Shia and some Sunni sources, two verses of the Quran are also associated with the Ghadir Khumm: the Verse of Ikmal (5:3), which announces the perfection of Islam, and the Verse of Tabligh (5:67), which urges Muhammad to fulfill his divine instructions. In the context of the Ghadir Khumm, the polysemous Arabic word is interpreted along sectarian lines. Shia sources interpret this word as meaning 'leader' or 'ruler', while Sunni accounts of this sermon tend to offer little explanation or substitute the word (of God, ) in place of . Shia views Shia Muslims view the Ghadir Khumm as Muhammad's most public announcement of Ali's succession. Supporting the Shia interpretation, the Shia Amini has compiled multiple volumes of Sunni and Shia historical documents about the Ghadir Khumm. Sunni views Among Sunni Muslims, the Ghadir Khumm is not associated with the succession to Muhammad. Instead, the event is often connected with Ali's earlier campaign in Yemen, where he is said to have strictly imposed the Islamic guidelines for a fair distribution of booty. The Sunni Ibn Kathir () suggests that the Ghadir Khumm sermon was simply intended as a public declaration of Muhammad's love and esteem for Ali in response to criticism of some soldiers. Accepting this explanation as such, that Muhammad equated Ali with himself in an extraordinary announcement at the Ghadir Khumm still provides a strong basis for the Shia claims, suggests Jafri. For the Sunni, it is also unimaginable that most companions would act wrongly and ignore a clear appointment of Ali at the Ghadir Khumm. The Shia response is that numerical strength cannot be a factor in a tribal community, adding that majority does not imply legitimacy in the Qur'an. Congregational prayer The most notable event that supports Abu Bakr's right to succession reportedly occurred towards the end of Muhammad's life. According to Walker, too ill to lead the prayers himself, Muhammad instructed Abu Bakr to take his place, ignoring concerns that he was too emotionally delicate for the role. In particular, when Muhammad entered the prayer hall one morning during the fajr prayer, Abu Bakr attempted to step back to let Muhammad lead the prayer but the prophet allowed Abu Bakr to continue. Authenticity Jafri finds the related traditions often contradictory, many of which are attributed by Ibn Sa'd () to Abu Bakr's daughter Aisha, whose rivalry