Sahih Bukhari Volume 001, Book 002, Hadith Number 032.

Narated By 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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