Hadith of the Twelve Successors will be anything other than twelve. The twelve successors from the hadith (traditions of the prophet Muhammad) are already known as The Twelve Imams. Two hadiths form the basis and understanding of the 12 successors of the Prophet Muhammad: the hadith of the two weighty things and the hadiths regarding the 12 khalifs. One of the most authentic hadith (traditions of the sayings of the Prophet Muhammad) is Hadith thaqalain in which the Prophet Muhammad tells the muslims that he is leaving behind two weighty things, The quran and his ahlul bayt. Al-Tirmidhi in his Sunan records the following tradition:
Introduction to the Science of Hadith chapters, each covering a hadith related issue. The first 33 chapters describe the various technical terms of hadith terminology which describe the conditions of a hadith's authenticity, or acceptability as a basis for Islamic jurisprudence. The following chapters relate to the "isnād", or chain of narration. Next are a series of chapters pertaining to the etiquette to be observed by hadith scholars and manners of transcription. The last chapters describe various issues relating to the narrators of hadith including naming conventions. Ibn al-Ṣalāḥ began the "Introduction" as a series of lectures he dictated to his students in Damascus ending in