Reference: Siyar A’laam an-Nubalaa – Volume 6, Page 208
It was said to ‘Abdullaah ibn al-Muqaffa’:
Who taught you good manners?
[I learnt them] myself. If I see anyone [who is] good, [then] I draw near to him, and if I see anyone [who is] ill-mannered, [then] I keep away from him.