The prophetic saying: «اللهم إنما أنا بشر أغضب کما یغضب البشرر أ أضَر کمرا یرَر البشر فمن لعنته من أحرد مرن أمتر فاجعلهرا لره زکرا أ ضحمر » has been mentioned in Sunni books as one of the prayers said by the prophet. Some of the terms used in this prayer have been reported in various forms. But the originality of the saying has been adopted by all scholars. This saying has served as the basis for the Sunnis’ method in studying ethics، prophethood، authority and anthropology. It should be investigated that whether this saying is authentic or it has been changed by the Hadith forgers due to various reasons. Given the prophet’ s explicit warning about the Hadith forgery and the possibility of attributing false speeches to the prophet، this essay tries to inspect the authenticity of this Hadith from the two aspects of its content and isnad and will try to evaluate the Hadith by comparing it with other Hadiths and Quran. It seems that the first part of the Hadith is original and valid، but the second part which says: « فمن لعنته من أحد من أمت فاجعلهرا لره زکرا أ ضحمر » is gorged and has been fabricated for the purpose of purifying some of the Companions.