Bukhari :: Book 1 :: Volume 2 :: Hadith 32
Narrated Abu Huraira:
The Prophet said, "The signs of a hypocrite are three:
1. Whenever he speaks, he tells a lie.
2. Whenever he promises, he always breaks it (his promise ).
3. If you trust him, he proves to be dishonest. (If you keep something as a trust with him, he will not return it.)"
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