Clarification of the Transmission Chain to Al-Hasan Ibn Mahbub

Everything in this book that is narrated from Al-Hasan ibn Mahbub has been transmitted by me from Muhammad ibn Musa ibn Al-Mutawakkil - may Allah سبحانه وتعالى be pleased with him - from Abdullah ibn Ja'far Al-Himyari and Sa'd ibn Abdullah, from Ahmad ibn Muhammad ibn 'Isa, from Al-Hasan ibn Mahbub.