The event of Ghadir Khumm occurred while the Muslims were returning from the Farewell Pilgrimage. According to Shia belief, a verse of the Quran was revealed instructing Muhammad to deliver an important message. The Muslims were gathered and Muhammad delivered a lengthy sermon. The speech included the famous statement by Muhammad that "nyone who has me as his "mawla", has Ali as his "mawla"". Shi'ites interpret this phrase to be the designation of Ali as Muhammad's heir, though this is disputed by Sunni Muslims. Shia traditions also state that the last verse of the Quran, which is the third verse of Al-Ma'idah (the fifth chapter of the Quran), was then revealed: "This day I have perfected your Religion for you: Completed My favour upon you, and have chosen for you Islam as your Religion."