Sahih Al Bukhari – Book of Wills And Testaments (Wasaayaa)
Volumn 004, Book 051, Hadith Number 012.
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Narated By Abu Huraira RA : The Prophet PBUH said, "The signs of a hypocrite are three: Whenever he speaks he tells a lie; whenever he is entrusted he proves dishonest; whenever he promises he breaks his promise."
Junaid Tahir