1. Whenever he is entrusted, he betrays.
2. Whenever he speaks, he tells a lie.
3. Whenever he makes a covenant, he proves treacherous.
4. Whenever he quarrels, he behaves in a very imprudent, evil and insulting manner."
In-book : Book 2, Hadith 27
USC-MSA web (English) : Vol. 1, Book 2, Hadith 34 (deprecated)