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The four qualities of a munafiq.
The Messenger of Allah (peace be upon him) said, “Whosoever possesses these four characteristics is a sheer hypocrite, and anyone who possesses one of them possesses a characteristic of hypocrisy till he gives it up. These are: when he is entrusted with something, he proves dishonest; when he speaks, he tells a lie; when he makes a covenant, he proves treacherous; and when he quarrels, he behaves in a very imprudent, evil, insulting manner.”
[Al-Bukhari and Muslim]