shows that these books were solely reported from Imam Jafar Sadiq A.S. It is possible to compromise between this. There might be Usul based upon the reports of Imam Jafar Sadiq A.S. and another collection based upon the report of all the Imams.
Now we shall deal with individuals as below; starting with those from the Tabi’ites:
He was a freed salve of the Prophet (SAWW) and a companion of Amir-ul-Momineen Ali Bin Abi Talib (A.S.). He was the secretary and treasurer of the latter. An-Najashi has said during his discussion of the first group of the Shi’ite authors, after giving an account of Abi Rafe who had himself compiled a book on Sunun, Religious Injunctions and problem. Ibn Abi Rafe wrote another book. His full name is Ali Bin Abi Rafe. He was a Tabi’ite and one of the chosen Shiites. He was a companion of Amir-ul-Momineen Ali Bin Abi Talib (A.S.) and his secretary. He gathered a lot and collected a book on the various branches of Jurisprudence Keeping this statement in view we can say that Ali bin Abi Rafe was the pioneer of writing a book on Jurisprudence and classifying the subject under various headings. As-Suyuti has said in Al-Awail that ht first one to write a book on jurisprudence after the first century of Abu Hanifah. But Ali Bin Rafe was during the time of Amir-ul-Momineen Ali Bin Abi Talib (A.S.) that is during first half of the first century or before the birth of Imam Abu Hanifah. He died during the first century.
He compiled a book on the judgments of Amir-ul-Momineen Ali Bin Abi Talib (A.S.). This book has been mentioned by Ash-Shaikh in Al-Fahrist. He has also quoted the authorities who are Muhammad Bin Ubaidullah Bin Abi Rafe from his father Ubaidullah Bin Abi Rafe who got from his father Abi Rafe who in turn received it directly from Amir-ul-Momineen Ali Bin Abi Talib (A.S.). He is also among the pioneers who wrote on jurisprudence. We have already briefly discussed Abi Rafe and his two sons. Ubaidullah Bin Abi Rafe died during the mid-first century
According to An-Najashi, he was a very close friend and companion of from Amir-ul-Momineen Ali Bin Abi Talib (A.S.) and lived after His martyrdoms. An-Najashi has reported about his oath given to Al-Ashtar and his will to his son Muhammad, along with the authorities in support of these two documents.
He wrote a book abut novelties of the judgments and orders given by from Amir-ul-Momineen Ali Bin Abi Talib (A.S.).This book has been reported by Muhammad bin Ali Bin Ibrahim Bin Hashim Al-Qummi from his father and grandfather who received it from Muhammad Bin Walid who in turn got it from Muhammad Bin Al-Furat. The later received it from the author Asbagh Bin Nabatah – himself. We have got a manuscript copy of this book. He died during the mid-first century.
An-Najashi has described him in the beginning of his book as belonging to the first group of the Shiite writers. He has also mentioned that Rabiah compiled a book on Zakat-un-Niam which was narrated to him by Amir-ul-Momineen Ali Bin Abi Talib (A.S.). He has also quoted the authorities in support of this statement. Rabiah died during the first century.