Usd al-Ghaba fi Ma'rifat al-Sahaba, by the renowned historian Izz al-Din Ibn al-Athir al-Jazari, is a monumental biographical encyclopedia of the Prophet Muhammad's Companions. This comprehensive 8-volume set, complete with detailed indexes, meticulously documents the lives, lineages, and contributions of thousands of Sahaba. It stands as a cornerstone reference in Islamic history and the science of Hadith, providing invaluable insights for scholars and researchers into the foundational generation of Islam. The work is celebrated for its extensive coverage and systematic organization, making it an indispensable resource.