Clarification of the Transmission Chain to Ahmad Ibn Muhammad Ibn Mutahhar, Companion of Abu Muhammad, Peace Be Upon Him

And whatever is narrated from Ahmad ibn Muhammad ibn Mutahhar, the companion of Abu Muhammad, peace be upon him, I have narrated it from my father and Muhammad ibn Al-Hasan - may Allah سبحانه وتعالى be pleased with them both - through Sa'd ibn Abdullah and Abdullah ibn Jafar Al-Himyari, all from Ahmad ibn Muhammad ibn Mutahhar, the companion of Abu Muhammad, peace be upon him.