God says
But when you are greeted with a greeting [of peace], answer with even a better greeting, or [at least] with the like thereof……Q.4: 86
Behold, We have willed that all beauty on earth be a means by which We put men to a test,* [showing] which of them are best in conduct. Q.18: 7
* Lit., “We have made all that exists on earth as its adornment in order that We might put them [i.e., all human beings] to a test”: meaning that God lets them reveal their real characters in their respective attitudes – moral or immoral – towards the material goods and benefits which the world offers them. In further analysis, this passages implies that the real motive underlying men’s refusal to believe in God’s spiritual messages (see verse 18:6) is almost their excessive, blind attachment to the goods of this world, combined with a false pride in what they regard as their own achievements.
Indeed in the Apostle of God you have an excellent example for everyone who looks forward [with hope and awe] to God and the Last Day, and remembers God unceasingly. - Q.33: 21
And [know that] whoever pays heed unto God and His Apostle has already attained to a mighty triumph. - Q.33: 71
But [since] good and evil cannot be equal, repel thou [evil] with something that is better -- and lo! he between whom and thyself was enmity [may then become] as though he had [always] been close, a true friend! - Q.41: 34
Prophet said
1. “The best of you is he who is best in conduct” – H: Bukhari and Muslim. N: Abdullah-b-Amr.
3. “Two attributes though easy for man (to adopt) will be very heavy, (indeed), in God’s scale on the Resurrection Day: To remain mostly silent (of frivolous talk) and (to be of) good conduct. By Him who holds my life, as for actions, these attributes have no parallel for mankind.” – H: Baihaqi. N: Anas.