Most of its forged parts came during the reign of Benu Umayya, whereas the real parts are divided into four groups: the Sahih, or genuine; the Moothaq, which are not as strong; the Hasan, inferior in authenticity; and the Dha'eef, which are not very reliable.  
Most of its forged parts came during the reign of Benu Umayya, whereas the real parts are divided into four groups: the Sahih, or genuine; the Moothaq, which are not as strong; the Hasan, inferior in authenticity; and the Dha'eef, which are not very reliable.  Marked by matn, or text, and isnads, or chains of corroboration, important compilations of it include The Book of the Authentic Collection by al-Bukhari.  Its development in the three centuries following Muhammad's death parallels the evolution of Islam's treatment of social, commerical, legal, and moral matters.  The sunnah is derived from this major source of religious law and moral guidance.  Second in authority to the Quran, FTP, identify this record of the sayings of the prophet Muhammad.
Most of its forged parts came during the reign of Benu Umayya, whereas the real parts are divided into four groups: the Sahih, or genuine; the Moothaq, which are not as strong; the Hasan, inferior in authenticity; and the Dha'eef, which are not very reliable.  
Hadith