The research deals with the biography of an imam from the imams of criticism in the science of hadith, and highlights his scientific position in this science, this imam is Al-Hafiz Abu Bakr Ahmed bin Amr Al-Bazzar (d.292 AH), who is known for his great and Mua'ellel Musnad.The most important characteristic of this research is the important additions in the narration of Al-Bazzar's books, and tryin...