The verse of refers to verse of 5:67 of the Quran, the central religious text of Islam, which reads
Among various Sunni views, this verse is sometimes connected to Muhammad's criticism of Jews and Christians, or viewed as evidence of his faithfulness in transmitting the divine revelations. In Shi'a Islam, this verse spurred Muhammad to deliver an announcement at the Ghadir Khumm in 632 CE about his cousin and son-in-law 'Ali ibn Abi Talib, which in Shi'a theology signifies the divine investiture of 'Ali with the spiritual authority over Muslims. A few Sunni authors have similarly linked this verse to 'Ali's merits.
See main article: Farewell Pilgrimage and Ghadir Khumm.
Shortly before he died in 632 CE, the Islamic prophet Muhammad performed the Hajj ritual in Mecca, which has become known as his Farewell Pilgrimage. In his sermon in Mecca at Arafat, and also later at the Ghadir Khumm by some accounts, he alerted Muslims about his impending death. On his return trip to Medina after performing the Hajj, Muhammad called the Muslim caravan to a halt at the Ghadir Khumm .
There Muhammad gave a sermon in which he announced, "Anyone who has me as his, has this Ali as his ," as reported by some canonical Sunni and Shia sources, including and . In particular, the former source adds that Muhammad repeated this statement three or four times and that his companion Umar congratulated Ali after the sermon, "You have now become of every faithful man and woman."
While the authenticity of the Ghadir Khumm is rarely contested, the interpretation of the Arabic word is a source of controversy between Sunni and Shia. In this context, Shia sources interpret this word as meaning 'leader', 'master', or 'patron', and thus see the Ghadir Khumm as the appointment of Ali to succeed Muhammad on both the spiritual and temporal levels, while Sunni accounts of this sermon tend to offer little explanation or substitute the word (of God,) in place of . Sunni authors argue that Muhammad did not explicitly refer to Ali as his successor in his sermon, while the Shia writer Abdul Hosein Amini enumerates the Sunni and Shia sources that corroborate the Shia interpretation in his multivolume .
Sunni scholars proffer various theories about the verse of . Possibly because the verse is placed in the context of a critical discussion of the People of the Book (adherents of earlier monotheistic faiths,), some Sunni authors conclude that Muhammad was hesitant to convey this criticism. Such is the view of al-Tabari, a prominent Sunni exegete. Alternatively, the Sunni exegete al-Zamakhshari suggests that the verse equates concealing any part of the divine revelations with concealing all of it and includes a tradition in which Muhammad is threatened with divine punishment in that case. A similar view is voiced by al-Baydawi, another Sunni exegete. Muhammad's wife Aisha may have considered this verse as evidence of his faithfulness in transmitting the divine revelations.
The promised protection in this verse has led some to conclude that Muhammad at times feared the reaction to his messages. A Sunni tradition alleges that Muhammad hid parts of the revelations in Mecca but was ordered by this verse to reveal them when the Muslim community strengthened. Yet other reports claim that Muhammad had bodyguards until the verse of assured his safety. Some other reports collected by the Sunni exegetes al-Tabari and al-Qurtubi link this verse to the story of a Bedouin Arab who reportedly attempted to kill an unguarded Muhammad, although a similar explanation is also given for verse 5:11 of the Quran. Another Sunni view is that Muhammad was afraid of the Quraysh tribe.
A few Sunni authors link this verse to the spiritual merits of Ali and the Ghadir Khumm, while some others link this verse to Muhammad's sermon at Arafat, a few days before the Ghadir Khumm. Similar to the Shia, these authors associate the verse of with the final directives issued by Muhammad. The Islamic philosopher Hossein Nasr and his coauthors view as most plausible such a link between the verse of and the events that followed the Farewell Pilgrimage, including the Ghadir Khumm. Their justification is that chapter () five of the Quran is often associated with Muhammad's final years in Medina, while verses 111 of this are specifically linked to the Farewell Pilgrimage by many authorities.
Shia traditions relate the verse of to the Ghadir Khumm, stressing that Muhammad was concerned about implementing his divine instruction, fearing the reaction of some of his companions. It was only after the revelation of the verse of, which urged him to fulfill his task and ensured his safety, that Muhammad gave his sermon at the Ghadir Khumm. There he announced the spiritual authority of Ali over Muslims, according to the Shia interpretation of the event. The divine instruction in question is specified as verse 5:55, also known as the verse of, in a tradition attributed to the Shia imam Muhammad al-Baqir .
The Shia exegete Muhammad H. Tabatabai similarly notes that the verse of evidently refers to an announcement without which the prophetic mission would have failed. The verse also suggests that Muhammad had delayed that announcement, perhaps fearing opposition and awaiting suitable circumstances, until his safety was assured by the verse of . Therefore, he argues, this matter could have not been a regular religious injunction for withholding an injunction could not have destructed Islam. Nor did Muhammad fear anyone in preaching the Islamic injunctions. For Tabatabai, this all supports the Shia traditions that link the verse of to the Ghadir Khumm and the divine investiture of Ali with spiritual authority over Muslims therein.