It is narrated on the authority of Abdullah b. 'Amr that the Prophet observed:
There are four characteristics, whoever has them all is a pure hypocrite, and whoever has one of its characteristics, he has one of the characteristics of hypocrisy, until he gives it up: When he speaks he lies, when he makes a covenant he betrays it, when he makes a promise he breaks it, and when he disputes he resorts to obscene speech. In the narration of Sufyan (one of the narrators) it is: And if he has one of them, he has one of the characteristics of hypocrisy.