The moment
In the ninth century scholars sifted a vast mass of reports about Muhammad's words and deeds into collections such as the Ṣaḥīḥs of al-Bukhārī and Muslim, which Sunnis rank second only to the Qur'an. The four Sunni schools of law took their names from Abū Ḥanīfa, Mālik, al-Shāfiʿī and Ibn Ḥanbal.
People: al-Bukhārī, Muslim ibn al-Ḥajjāj, al-Shāfiʿī, Aḥmad ibn Ḥanbal