Everything in this book that is narrated from Abu Hamzah Al-Thumali has been transmitted by me from my father - may Allah سبحانه وتعالى be pleased with him - from Sa'd ibn Abdullah, from Ibrahim ibn Hashim, from Ahmad ibn Muhammad ibn Abi Nasr Al-Bazanti, from Muhammad ibn Al-Fudayl, from Abu Hamzah Thabit ibn Dinar Al-Thumali. Dinar was known by the kunya Abu Safiyyah. He was from a clan of Banu Tha'l and was attributed to Thumalah because his residence was among them. He passed away in the year 150 AH. He was trustworthy and just (thiqa 'adl) and met four Imams: Ali ibn Al-Husayn, Muhammad ibn Ali, Ja'far ibn Muhammad, and Musa ibn Ja'far (peace be upon them all). Although there are many transmission routes to him, I have sufficed with mentioning only one of them.