Aayeshah Radiyallahu ‘Anha reports. “A person asked permission to present himself before Rasulullah Sallallahu ‘Alayhi Wasallam while I was with him. Rasulullah Sallallahu ‘Alayhi Wasallam said:‘What a bad person is he among his community’. After saying this, he gave him permission to enter. After the person entered, he spoke very softly to him. When the person left I said: ‘O Rasulullah, you said what you said before he entered, then you spoke so softly to him,. Rasulullah Sallallahu ‘Alayhi Wasallam said: ‘O ‘Aayeshah, the worst person is that who stops speaking to one because of his indecency'”.
English reference : Book 47, Hadith 333 Arabic reference : Book 48, Hadith 350