Everything in this book that is narrated from Sayf ibn Umayrah has been transmitted by me from Muhammad ibn Al-Hasan - may Allah سبحانه وتعالى be pleased with him - from Muhammad ibn Al-Hasan Al-Saffar, from Ahmad ibn Muhammad ibn Isa, from Ali ibn Sayf, from his brother Al-Husayn [ibn Sayf] from their father Sayf ibn Umayrah Al-Nakhai.