عَنْ أَبِي ذَرٍّ رَضِيَ اللَّهُ عَنْهُ أَنَّهُ سَمِعَ النَّبِيَّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «لاَ يَرْمِي رَجُلٌ رَجُلًا بِالفُسُوقِ، وَلاَ يَرْمِيهِ بِالكُفْرِ، إِلَّا ارْتَدَّتْ عَلَيْهِ، إِنْ لَمْ يَكُنْ صَاحِبُهُ كَذَلِكَ».
The Prophet (may Allah's peace and blessings be upon him) warned that whoever says to another person: You are a defiant sinner, or: You are a disbeliever, if this person is not as he said, then he will be worthy of this mentioned description, and his accusation will rebound on him. However, if this person is as he said, then nothing will rebound on him given that he said the truth.
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