The Islamic Tradition has begun by the prophet of Islam’s prophecy and in the Shi’a idea has been continued by the infallible Imams after he passed away, and after the second century has become permanent by the scholars’ writings and collections. In the Sunni world, though, after a decade of banning, the scholars began to collect the Tradition. In the third century, some muhaddiths (narrators of the Tradition) emerged to evaluate the narrations and separate the true from untrue, on the top of whom where the two prominent narrators Mohammad Ibn Ismael Al-Bukhari and Moslem Ibn Hajjag Al-Nishaburi, the authors of the two comprehensive books of “Sahihain”. The position of the two books before the Muslims is studied in this research