Narrated 'Aisha:A man asked permission to enter upon the Prophet. When the Prophet (ﷺ) saw him, he said, "What an evil brother of his tribe! And what an evil son of his tribe!" When that man sat down, the Prophet (ﷺ) behaved with him in a nice and polite manner and was completely at ease with him. When that person had left, 'Aisha said (to the Prophet). "O Allah's Apostle! When you saw that man, you said so-and-so about him, then you showed him a kind and polite behavior, and you enjoyed his company?" Allah's Messenger (ﷺ) said, "O 'Aisha! Have you ever seen me speaking a bad and dirty language? (Remember that) the worst people in Allah's sight on the Day of Resurrection will be those whom the people leave (undisturbed) to be away from their evil (deeds)."
حَدَّثَنَا عَمْرُو بْنُ عِيسَى، حَدَّثَنَا مُحَمَّدُ بْنُ سَوَاءٍ، حَدَّثَنَا رَوْحُ بْنُ الْقَاسِمِ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، أَنَّ رَجُلاً، اسْتَأْذَنَ عَلَى النَّبِيِّ صلى الله عليه وسلم فَلَمَّا رَآهُ قَالَ " بِئْسَ أَخُو الْعَشِيرَةِ، وَبِئْسَ ابْنُ الْعَشِيرَةِ ". فَلَمَّا جَلَسَ تَطَلَّقَ النَّبِيُّ صلى الله عليه وسلم فِي وَجْهِهِ وَانْبَسَطَ إِلَيْهِ، فَلَمَّا انْطَلَقَ الرَّجُلُ قَالَتْ لَهُ عَائِشَةُ يَا رَسُولَ اللَّهِ حِينَ رَأَيْتَ الرَّجُلَ قُلْتَ لَهُ كَذَا وَكَذَا، ثُمَّ تَطَلَّقْتَ فِي وَجْهِهِ وَانْبَسَطْتَ إِلَيْهِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " يَا عَائِشَةُ مَتَى عَهِدْتِنِي فَحَّاشًا، إِنَّ شَرَّ النَّاسِ عِنْدَ اللَّهِ مَنْزِلَةً يَوْمَ الْقِيَامَةِ مَنْ تَرَكَهُ النَّاسُ اتِّقَاءَ شَرِّهِ ".
Bukhari
Good Manners and Form (Al-Adab) • Hadith 62