Clarification of the Transmission Chain to Ali Ibn ri'ab

Everything in this book that is narrated from Ali ibn Ri'ab has been transmitted by me from my father and from Muhammad ibn Al-Hasan - may Allah (swt) have mercy on them both - from Sa'd ibn Abdullah and Al-Himyari, from Ahmad ibn Muhammad ibn 'Isa and Ibrahim ibn Hashim together, from Al-Hasan ibn Mahbub, from Ali ibn Ri'ab.