Sahih al-Bukhari 6032
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 ‏"‏‏.‏