الفسق
Abu Dharr (may Allah be pleased with him) reported that he heard the Prophet (may Allah's peace and blessings be upon him) saying: "No man accuses another of impiety or disbelief except that it (the accusation) rebounds on him if the one accused is not as he said."  
عن أبي ذر -رضي الله عنه- أنه سمع النبي -صلى الله عليه وسلم- يقول: «لا يَرْمِي رَجُل رَجُلًا بِالفِسْقِ أو الكُفْر إلا ارْتَدَّتْ عليه، إن لم يَكُنْ صَاحبه كذلك».

شرح الحديث :


The Prophet (may Allah's peace and blessings be upon him) prohibited that a man says to another: "You are impious or a disbeliever", because if this person is not as he said: then this word will rebound to the one who said it.  

ترجمة نص هذا الحديث متوفرة باللغات التالية