Al-Tabaqat al-Kubra, often translated as 'The Book of the Major Classes,' is a seminal biographical dictionary compiled by the renowned early Islamic scholar Ibn Sa'd. This monumental work meticulously documents the lives of the Prophet Muhammad, his companions, and the successive generations of early Muslims. It serves as an invaluable primary source for Islamic history, hadith studies, and prosopography, offering detailed accounts of individuals, their lineage, teachers, students, and contributions to the nascent Muslim community. The edition by Dr. Ihsan Abbas is particularly esteemed for its scholarly rigor and critical apparatus, making this classic text accessible to modern researchers and students. Published by Dar Sader, this volume, likely part 9/1, continues the comprehensive historical narrative.