Muslim ibn al-Hajjaj
was utilized early in hadith scholarship by Ali ibn al-Madini (161–234 AH). Later, al-Madini's student Muhammad al-Bukhari (810–870) authored a collection, now known as "Sahih Bukhari", commonly accepted by Sunni scholars to be the most authentic collection of hadith, followed by that of his student Muslim ibn al-Hajjaj. Al-Bukhari's methods of testing hadiths and "isnads" are seen as exemplary of the developing methodology of hadith scholarship.