Clarification of the Transmission Chain to Ubayd Ibn Zurarah

Everything in this book that is narrated from Ubayd ibn Zurarah has been transmitted by me from my father - may Allah (swt) be pleased with him - from Sa'd ibn Abdullah, from Muhammad ibn Al-Husayn ibn Abi Al-Khattab, from Al-Hakam ibn Miskin Al-Thaqafi, from Ubayd ibn Zurarah ibn A'yun. He was known to have a squint (cross-eyed).