Ibn 'Abbas said, "Two men defamed one another in the time of the Messenger of Allah, may Allah bless him and grant him peace. One of them reviled the other who remained silent. The Prophet, may Allah bless him and grant him peace, remained seated. Then the other man answered him back and the Prophet, may Allah bless him and grant him peace, got up. He was asked, "You got up?" He said, "The angels left, so I left with them. While this man was silent, the angels were answering the one who cursed him. When he answered, the angels left."  

عَنِ ابْنِ عَبَّاسٍ قَالَ اسْتَبَّ رَجُلاَنِ عَلَى عَهْدِ رَسُولِ اللهِ ﷺ فَسَبَّ أَحَدُهُمَا وَالْآخَرُ سَاكِتٌ وَالنَّبِيُّ ﷺ جَالِسٌ ثُمَّ رَدَّ الْآخَرُ فَنَهَضَ النَّبِيُّ ﷺ فَقِيلَ نَهَضْتَ؟ قَالَ نَهَضَتِ الْمَلاَئِكَةُ فَنَهَضْتُ مَعَهُمْ إِنَّ هَذَا مَا كَانَ سَاكِتًا رَدَّتِ الْمَلاَئِكَةُ عَلَى الَّذِي سَبَّهُ فَلَمَّا رَدَّ نَهَضَتِ الْمَلاَئِكَةُ  

Umm ad-Darda' reported that a man came up to her and said, "A man has said bad things about you in the presence of 'Abdu'l-Malik.' She said, "We are suspected of something which we did not do. How often we have been praised for what we did not do!"  

أَنَّ رَجُلاً أَتَاهَا فَقَالَ إِنَّ رَجُلاً نَالَ مِنْكِ عِنْدَ عَبْدِ الْمَلِكِ فَقَالَتْ إِنْ نُؤْبَنَ بِمَا لَيْسَ فِينَا فَطَالَمَا زُكِّينَا بِمَا لَيْسَ فِينَا  

'Abdullah said, "When a man says to his companion, 'You are my enemy,' then one of them has left Islam or he is innocent of what his companion said.'"  

قَالَ الرَّجُلُ لِصَاحِبِهِ أَنْتَ عَدُوِّي فَقَدْ خَرَجَ أَحَدُهُمَا مِنَ الإِسْلاَمِ أَوْ بَرِئ مِنْ صَاحِبِهِ