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 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