 These traditions about the Mahdi appeared only at later times in hadith collections such as "Jami' at-Tirmidhi" and "Sunan Abi Dawud", but are absent from the early works of Bukhari and Muslim.Since Sunnism has no established doctrine of Mahdi, compositions of Mahdi varies among Sunni scholars.While some scholars like Ibn Khaldun even disputed the authenticity of references concerning the Mahdi in hadith literature, others like Ibn Kathir elaborated a whole apocalyptic scenario which included prophecies about Mahdi, Jesus and Dajjal during the endtime.