Clarification of the Transmission Chain to Yasir the Servant

Everything in this book that is narrated from Yasir, the servant of Imam Al-Rida عليه السلام, has been transmitted by me from my father - may Allah سبحانه وتعالى be pleased with him - from Ali ibn Ibrahim, from his father, from Yasir, the servant of Imam Al-Rida عليه السلام.