The Prophet (Sallallähu Alaihi Wasallam) 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.)" [[Sahih Bukhari: Volume 1, Book 2, Number 32 :Narrated by Abu Huraira]]