Hadith of the Quran and Sunnah Sunnah was said by Muhammad in front of the larger gathering during his Farewell Sermon, and the Hadith about Quran and Ahl al-Bayt was said by Muhammad in front of the smaller gathering at Ghadir Khumm, the Shi'as believe that only the 'Hadith of the two weighty things' is authentic. At the same time, Shi'as do agree with the meaning of the Hadith, even if they deem it a fabrication. The Shi'as believe in following the Sunnah of Muhammad, but they say that this is only possible via the Ahl al-Bayt (Muhammad's family). The Shi'as believe that Muhammad said "Hadith
Introduction to the Science of Hadith category, which comprises 21 types, relates to the names of the narrators. This includes the definition of a "ṣaḥābī" (companion), a "tābi`ī" (follower), the time periods of narrators, names and paidonymics among others. Later scholars included additional types of hadith in their own works, with some almost reaching 100. The "Introduction" became the basis for subsequent books in hadith terminology. A number of subsequent scholars followed Ibn al-Ṣalāḥ in the ordering of his book, including al-Nawawī, Ibn Kathīr, al-ʻIraqi, al-Bulqīnī, Ibn al-Jamā`ah, al-Tabrīzī, al-Ṭībī and al-Zirkashī. In many instances this influence was direct, with numerous scholars authoring books indicating its