Musnad al-Shafi'i (Arabic: مسند الشافعي), is one of the famous Hadith book attributed to Imam Abū ʿAbdullāh Muhammad ibn Idrīs Al-Shafi‘i (767–820 CE, 150–204 AH). Shah Abd Al-Aziz Ad-Dehlawi writes “This Musnad is used to designate the marfū’ hadīth which ash-Shāfi’ī related to his companions. Those of them which reached Abul-'Abbas Muhammad ibn Ya’qūb al-Asamm from what he heard from Rabi' ibn Sulaymān of the Kitāb al-Umm and al-Mabsūt were collected by him in one place; he called it the Musnad ash-Shāfi’ī. Source: Wikipedia (en)