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 al-Kattānī. `Āʼishah bint `Abd al-Raḥmān said in the foreword of her edition of the "Introduction": His book about the sciences of hadith is the best known of his works without comparison, to the extent that it is sufficient to say, "the Book of Ibn al-Ṣalāḥ", the intent being understood due to its popularity and stature. With the previous scholars, its subject matter overcame it, thus being referred to as, "the Book of Ibn al-Ṣalāḥ about `Ulūm al-Ḥadīth" or as he referred to it in its opening pages, "the Book of Familiarity with the Types of `Ulūm al-Ḥadīth". It has become