Some other books are:
Ilal-ush-Shara’I Lil Ahadith-ul-Mu’allalah.
He died in 381 AH.
First collection is Al-Kafi by Abu-Jafar Muahmmad Bin Yaqub Al-Kalini. He prepared this collection in thirty years and it contains 16099 Traditions with their authorities and sources, related to both Usul and Furu. Al-Kalini died in 328 AH.
Second collection is by As-Sudduq and is called as Man La Yahdiruhul Fiqh, which was prepared on the pattern of Man La Yahdiruhul Talib, as we have already said. It contains 9044 traditions. As-Sudduq died in 381 AH.
The third collection of the Traditions is Tahdhib-ul-Ahkam, by Ash-Shaikh Abi Jafar Muhammad Bin Al-Hassan At-Tusi. He divided it into 393 sections and it contains 13950 Traditions. The author died in 460 AH.
The fourth collection of the Traditions compiled during the period under reference is called Al-Istibsar Fil Jam’I Bain Ma Tu’arad Minal Akhbar. It has 920 sections and contains 551 Traditions.
Except the first collection all other collection are collections secondary injunction (Furu). In this way the total number of Traditions found in these collections comes upto 44244.
Ash-Shaikh Al-Baha’I has said in Al-Wajizah that the contents of our books on the Traditions are much more than the total contained in Sihah Sittah 1, as would be clear to a person who follows the Traditions collected by both the groups. A large number of scholars have written about these four collections of the Traditions in the forms of explanations, notes and commentaries. We cannot discuss all this work at this place. These books have been discussed at their proper places where we have taken up the life account of their authors. A few of these are:
Sharh-ul-Istibsar by Ash-Shaikh Muhammad Ibn Ash-Shaikh Hassan (the author of Al-Ma’alim) which contains many useful biographical pieces;
Mirat-ul-Uqul Fi Sharhil Kafi by Al-Majlisi;
Sharh Usul-il-Kafi by Mulla Saleh Al-Mazandarani;
Sharh Usul-il-Kafi by Mulla Sadra;
A large number of commentaries of At-Tahdhib and Al-Faqih the details of which will need much space and time here and are given in the latter chapters. In addition to these, a number of collections were prepared on the basis of the aforementioned four books, which we shall discuss when we take up the scholars of fourteenth century.