عن ابن عمر رضي الله عنهما قال: قال رسول الله صلى الله عليه وسلم : "إذا قال رجل لأخيه: يا كافر، فقد باء بها أحدهما، فإن كان كما قال وإلا رجعت عليه" ((متفق عليه)).
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Abu Dharr (May Allah be pleased with him) said
I heard the Messenger of Allah (ﷺ) saying, "If somebody accuses another of disbelief or calls him the enemy of Allah, such an accusation will revert to him (the accuser) if the accused is innocent."[Al-Bukhari and Muslim].