Who is the narrator of Ibn Abi Hatim Al-Razi's book "Al-Jarh wa al-Ta'dil," and who is it that states therein: "Abd al-Rahman al-Razi said"?

No specific narrator has been found who transmitted the book "Al-Jarh wa al-Ta'deel" from its author. The phrase "So-and-so said," found in the book, does not necessarily mean that it was dictated by the author and narrated from him by a transmitter. Rather, it is common in the books of early scholars who authored and wrote them themselves, as is the case in "Al-Muhalla" by Ibn Hazm and "Al-Tamheed" by Ibn Abd al-Barr, where the author refers to himself.