Sahih al-Bukhari 6054
Narrated `Aisha:
A man asked permission to enter upon Allah's Messenger (ﷺ). The Prophet (ﷺ) said, "Admit him. What an evil 
brother of his people or a son of his people." But when the man entered, the Prophet (ﷺ) spoke to him in a 
very polite manner. (And when that person left) I said, "O Allah's Messenger (ﷺ)! You had said what you had 
said, yet you spoke to him in a very polite manner?" The Prophet (ﷺ) said, "O `Aisha! The worst people 
are those whom the people desert or leave in order to save themselves from their dirty language or 
from their transgression."
حَدَّثَنَا صَدَقَةُ بْنُ الْفَضْلِ، أَخْبَرَنَا ابْنُ عُيَيْنَةَ، سَمِعْتُ ابْنَ الْمُنْكَدِرِ، سَمِعَ عُرْوَةَ بْنَ الزُّبَيْرِ، أَنَّ عَائِشَةَ ـ رضى الله عنها ـ أَخْبَرَتْهُ قَالَتِ، اسْتَأْذَنَ رَجُلٌ عَلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَقَالَ ‏"‏ ائْذَنُوا لَهُ بِئْسَ، أَخُو الْعَشِيرَةِ أَوِ ابْنُ الْعَشِيرَةِ ‏"‏‏.‏ فَلَمَّا دَخَلَ أَلاَنَ لَهُ الْكَلاَمَ قُلْتُ يَا رَسُولَ اللَّهِ قُلْتَ الَّذِي قُلْتَ، ثُمَّ أَلَنْتَ لَهُ الْكَلاَمَ قَالَ ‏"‏ أَىْ عَائِشَةُ، إِنَّ شَرَّ النَّاسِ مَنْ تَرَكَهُ النَّاسُ ـ أَوْ وَدَعَهُ النَّاسُ ـ اتِّقَاءَ فُحْشِهِ ‏"‏‏.‏