Anas Ibn Malik reported that hardly did the Holy Prophet Mohammed S.A.W. address us without saying: THERE IS NO IMAN IN HIM WHO CANNOT HOLD A TRUST AND NO RELIGION FOR HIM WHO DOES DOES NOT FULFILL HIS PROMISE.
source- Baihaqi
Abu Huraira reported that the holy prophet Mohammed S. A. W. passed by a heap of corn. He pressed his hand into it and felt it wet. He asked the owner: What is this? The owner said that it was wet because of rain. The holy prophet S.A.W. then said: Why did you not let it remain on top so that people could see it? He who cheats others is not one of us.
source- Muslim