Narrated `Aisha: A man asked permission to enter upon Allah's Apostle. The Prophet said, Admit him. What an evil brother of his people or a son of his people. But when the man entered, the Prophet spoke to him in a very polite manner. (And when that person left) I said, O Allah's Apostle! You had said what you had said, yet you spoke to him in a very polite manner? The Prophet 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.