Sahih Bukhari

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