Clarification of the Transmission Chain to Dawud Ibn Abi Zayd

Everything in this book that is narrated from Dawud ibn Abi Zayd has been transmitted by me from my father - may Allah سبحانه وتعالى be pleased with him - from Sa'd ibn Abdullah, from Muhammad ibn 'Isa ibn 'Ubayd, from Dawud ibn Abi Zayd.