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Sahih Bukhari
(1) 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.)" (Book #2, Hadith #32)