Ma`rifat Kalami

One of the important sources of formation of theological and religious beliefs for Muslims is Islamic hadiths. Therefore, it is necessary to pay attention to the originality and refinement of its sources. According to the majority of Ahl al-Sunna, ‘Sahih Muslim’ is the second authentic hadith book, written by Muslim Ibn Hajjaj Neyshaburi(206-261 LAH), one of the great hadith scholars of Ahl al-Sunna. It has a great position among Ahl al-Sunna and they accept its narrations without any investigation. This position requires the authenticity of the narrators, the chain of narration and the text of the hadith. Since some distortions (despite its negative theological, jurisprudential and etc. consequences) has entered many sources of Islamic texts - including narrative, convictional, historical, etc. - the question arises whether the mentioned book has been safe from distortion to be completely reliable or not? The purpose of this research is to answer this question, using a descriptive-analytical method and relying on various reliable Sunni sources. Its most important result is that the ominous event of distortion has entered this important and central book. These distortions are rooted in theological discussions and have some direct and indirect consequences, and require more precise researches.