Allah Taãla says in the Noble Qurãn, 'You are the best of nations sent to man. You command good and forbid evil and you believe in Allah'. (Aali Imraan).
Allah Taãla states that one reason for this Ummah being titled as the best of Ummah, is the practice of commanding good and preventing evil'.
The Prophet (صلى الله عليه واله وسلم) said,
"Whoever has the following four (characteristics) will be a pure hypocrite and whoever has one of the following four characteristics will have one characteristic of hypocrisy unless and until he gives it up.
1. Whenever he is entrusted, he betrays.
(( 2. Whenever he speaks, he tells a lie. ))
3. Whenever he makes a covenant, he proves treacherous.
4. Whenever he quarrels, he behaves in a very imprudent, evil and insulting manner.