A hadith is a saying, action or approval of the Prophet (PBUH). The Sunnah is his way of life. Hadith are the second source of Islamic law after the Qur'an. A hadith has a chain of narrators (isnad) and the text (matn). Famous collectors include Imam Bukhari, Imam Muslim, Abu Dawud, Tirmidhi, Nasai and Ibn Majah.