Muslim ibn al-Hajjaj
His book is highly regarded among Sunni Muslims, and considered the most authentic collection of hadith, even ahead of the Muwatta Imam Malik and Sahih Muslim of Bukhari's student Muslim ibn al-Hajjaj. Most Sunni scholars consider it second only to the Quran in terms of authenticity. He also composed other books, including "al-Adab al-Mufrad", which is a collection of hadiths on ethics and manners, as well as two books containing biographies of hadith narrators (see isnad).