Ar - resaleh Fi ketab Al-Kafi (A book about Al-kafi) By nsheikh Agha Bozorg Tehrani

The holy prophet of Allah (p.b.u.h) encouraged all the muslims to obtain education an knowledge. However, it was not abligatory to all muslims. Those who were competent to learn knowledge, were asked to teach other muslims. Those learned men wrote their knowledge in the notebooks, which were called later as "Osoul (Fundamental). 400 of these "Qsouls" were distinguished over others. They were handed over from a generation to another, until it was provided to Sheikh Kolaini, who used those books in preparing and completion of his book. After centuries the sources which were available to kolaini, were demolis shed, and some of the scholars felt it necessary to repeat the evaluation of the narrations collected in Osoul Al -Kafi. Hence, the scholars of the 7 th century'(A.H.) put measures and scales for evaluation of the narrations.His excellency Sheikh Agha Bozorg Tehrani, the great shia bibliographer in the 14 A.H.century in this short book, which is published here for the first time; discusses the method and procedure used by H.E. Kolaini in collecting the book "Al-kafi", and evaluation and assessment of this valueable book by the scholars in next centuries.Key words: " Al - Kafi", evaluation / Kolaini, Mohammad bin Yaghoub /Shia narrations, 4th century (a.h) / the 400 Osoul books /Shia narrations, 7th century/ Shia narrations, evaluation and review.