السقط في الاسناد والآثار المترتبة عليه عند محدثي العامة

N Praise be to Allah , the Lord of worlds , prayer and peace be upon his messenger and his pure household. The holy Hadith is considered the second source of Islamic legislation after the holy Quran , it is a means to interpret the holy Quran. 19 Islamic nation , since the prophet era , was interested in writing and reciting or narrating the Hadiths and to follow its instructions , and study lives of the narrators , examine the Hadiths in the terms of acceptance and refusal according to the rules of the scientific criticizing within a very important science which is known as Hagiography . The science of validating and invalidating narrators is a science that no other nation knows. Hence the term which is known as Hadith reside , it is a science that every one who interested in Hadith had to be a acquainted with it and with it's rules to maintain the hadithes as a means to maintain Sharia. To do so we have examine the validity and accuracy . There are more than one reason that motivate me to study this subject : Firstly: to serve the holy Hadith as a means to serve the Islam and Moslims. Secondly : there is no such study to deal with validity and accuracy. Thirdly : to collect all what was written about validity which is scattered in the different resources and references. Fourthly : the research aims at approximate the opinions of Islamic sects upon accepting the narration according to the opinion of Shaik Al- Tosy. Fifthly : the researcher found that validity is a point of disagreement among the narrators and he tried to study the reasons of this disagreement. The resource on which the researcher depends are varied to be Jurisprudential , osuli and linguistical as well as the references of Hadith and its terms