Grant him permission. (and also added: ) He is a bad son of his tribe or he is a bad person of his tribe. When he came in he used kind words for him. 'A'isha reported that she said: Messenger of Allah, you said about him what you had to say and then you treated him with kindness. He said: A'isha, verily in the eye of Allah, worst amongst the person in rank on the Day of Resurrection is one whom the people abandon or desert out of the fear of indecency.  

أَنَّ رَجُلاً اسْتَأْذَنَ عَلَى النَّبِيِّ ﷺ فَقَالَ ائْذَنُوا لَهُ فَلَبِئْسَ ابْنُ الْعَشِيرَةِ أَوْ بِئْسَ رَجُلُ الْعَشِيرَةِ فَلَمَّا دَخَلَ عَلَيْهِ أَلاَنَ لَهُ الْقَوْلَ قَالَتْ عَائِشَةُ فَقُلْتُ يَا رَسُولَ اللَّهِ قُلْتَ لَهُ الَّذِي قُلْتَ ثُمَّ أَلَنْتَ لَهُ الْقَوْلَ قَالَ يَا عَائِشَةُ إِنَّ شَرَّ النَّاسِ مَنْزِلَةً عِنْدَ اللَّهِ يَوْمَ الْقِيَامَةِ مَنْ وَدَعَهُ أَوْ تَرَكَهُ النَّاسُ اتِّقَاءَ فُحْشِهِ  

This hadith has been reported on the authority of Ibn Munkadir with the same chain of transmitters but with a slight variation of wording.  

أَنَّهُ قَالَ بِئْسَ أَخُو الْقَوْمِ وَابْنُ الْعَشِيرَةِ