Imam Muslim compiled Sahih Muslim, the second of the Sahihayn (the two most authentic collections). Together with al-Bukhari, his work forms the backbone of Sunni hadith-based law and theology.
Imam al-Nawawi's commentary on Sahih Muslim is among the most widely studied works in madrasas worldwide.
What is bid'a?
SeekersGuidance
Classical use of sound hadith corpora in legal reasoning.