Hadith of the Quran and Sunnah al-Thaqalayn" multiple times in multiple settings in multiple wordings. They argue that Muhammad said "Hadith al-Thaqalayn" at Mount Arafat during his Farewell Sermon, at Ghadir Khumm, in the mosque of Medinah, during his last illness, and at many other places and times. The Shi'as believe that Muhammad said this hadith so many times because he wanted to stress how important it was that the Muslims only take his own descendants as leaders. The Shi'as believe that this hadith is mutawattir, meaning that it has been related so many times by so many people that there is no doubt about its
Hadith "the documentation" of the Sunnah. Another source (Joseph A. Islam) distinguishes between the two saying: Whereas the 'Hadith' is an oral communication that is allegedly derived from the Prophet or his teachings, the 'Sunna' (quite literally: mode of life, behaviour or example) signifies the prevailing customs of a particular community or people. ... A 'Sunna' is a practice which has been passed on by a community from generation to generation en masse, whereas the Ahadith are reports collected by later compilers often centuries removed from the source. ... A practice which is contained within the Hadith may well be regarded