Hadith on Takfir: False accusations will backfire against accusers

Abu Dharr reported: The Prophet, peace and blessings be upon him, said, “A man does not accuse another man of wickedness or unbelief but that it will be turned against him, if his companion is innocent.”

Source: Ṣaḥīḥ al-Bukhārī 6045

Grade: Sahih (authentic) according to Al-Bukhari

عَنْ أَبِي ذَرٍّ رَضِيَ اللَّهُ عَنْهُ أَنَّهُ سَمِعَ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ لَا يَرْمِي رَجُلٌ رَجُلًا بِالْفُسُوقِ وَلَا يَرْمِيهِ بِالْكُفْرِ إِلَّا ارْتَدَّتْ عَلَيْهِ إِنْ لَمْ يَكُنْ صَاحِبُهُ كَذَلِكَ

6045 صحيح البخاري كتاب الأدب باب ما ينهى من السباب واللعن