Hadith same text are each counted as individual ahadith. If, say, ten companions record a text reporting a single incident in the life of Muhammad, hadith scholars can count this as ten hadiths. So Musnad Ahmad, for example, has over 30,000 hadiths—but this count includes texts that are repeated in order to record slight variations within the text or within the chains of narrations. Identifying the narrators of the various texts, comparing their narrations of the same texts to identify both the soundest reporting of a text and the reporters who are most sound in their reporting occupied experts of hadith
Hadith of the Twelve Successors be from the tribe of Quraysh. Interpretation of the hadith varies widely among Sunni scholars; some have openly claimed that they do not know the meaning. Another interpretation is that the prophecy was fulfilled by the Rashidun Caliphs. Some commentators, such as Ibn Kathir and Ibn Taymiyya, link this hadith with the biblical account of Moses and his twelve deputies. Imam Muslim on Sahih Muslim wrote: Rasulullah s.a.w said: "This religion (Islam) will remain standing until twelve caliph, which all of them is from Quraysh, rule over you." (Sahih Muslim) Imam Abu Dawud on Shahih Abi Dawud wrote: Masyruq said: