'A'isha said, "A man asked permission to come to the Messenger of Allah, may Allah bless him and grant him peace, and the Messenger of Allah said, 'He is an evil son of his tribe.' When the man came in, the Prophet was courteous and cheerful towards him. When that man left, another man asked permission to come in. He said, 'He is an excellent son of his tribe.' When he came in, he was not cheerful towards him as he had been cheerful towards the other man. When he left, I said, 'Messenger of Allah, you said what you said about so-and-so and yet you were courteous to him. You said what you said about so-and-so and I did not see you do the same.' He said, ''A'isha, the worst of people are those who are feared on account of their bad language.'"