Sahih Bukhari Volume 001, Book 002, Hadith Number 033.
Sahih Bukhari Book 02. Belief
Narated By 'Abdullah bin 'Amr : The Prophet said, "Whoever
has the following four (characteristics) will be a pure hypocrite
and whoever has one of the following four characteristics will
have one characteristic of hypocrisy unless and until he gives it
up.
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."