including the canonical Sahih Muslim and Sunan al-Tirmidhi. Veccia Vaglieri writes that Muhammad recited the Verse of Purification every morning when he passed by Fatima's house to remind them of the prayer. This makeup of the Ahl al-Bayt is echoed by Veccia Vaglieri and Jafri, and unanimously reported in Shia sources. Inclusion of Muhammad's wives Possibly because the earlier injunctions in the Verse of Purification are addressed at Muhammad's wives, some Sunni authors, such as Ibn Kathir, include Muhammad's wives in the Ahl al-Bayt. A number of Sunni hadiths also support the inclusion of Muhammad's wives in the Ahl al-Bayt. This view is shared by Goldziher and his coauthors. Alternatively, Leaman argues that only those wives of prophets who mother their successors are counted by the Quran in their . Significance in Sunni Islam Some Sunni versions of this hadith replace with . Esposito elaborates, "The Prophet Muhammad is seen as the 'living Quran,' the embodiment of God's will in his behavior and words. Sunni Muslims ... take their name from , meaning those who follow the example of the Prophet." Both Sunni and Shia Muslims uphold the Quran and the Sunna, though the Shia extends Sunna to also include the traditions and practices of their Imams. Significance in Twelver Shia Islam Hadith al-Thaqalayn implies that the Quran and Muhammad's progeny jointly serve as the only source of divine guidance after Muhammad, writes the Twelver Tabatabai. He argues that a divine guide must be infallible lest he leads his followers astray. As such, he notes, Muhammad's progeny in the hadith must refer only to specific descendants of Muhammad, whom the Twelvers refer to as Imams. In particular, Tabatabai argues that the earth is never void of an infallible Imam of Muhammad's descent as the leader and guide of humankind in his time by divine designation. These are the Twelve Imams for the Twelver Shia. The last of these Imams, Muhammad al-Mahdi, went into occultation in 260/873-874 and his advent is awaited by the Twelvers. While there are differences in details, the belief in the eschatological Mahdi remains popular among all Muslims, possibly owing to numerous traditions to this effect in canonical Sunni and Shia sources. See also References Sources Hadith Shia Islam Sunni Islam The Fourteen Infallibles