An-Nawwas ibn Sam’aan reported that Prophet Muhammad peace be upon him said:
"Righteousness is good character, and sin is whatever bothers you and you do not want people to know." (Saheeh Muslim)
Hence one can say that Islam as a whole came to perfect good manners, as did the Prophet himself:
"Indeed I was only sent to complete the most noble character traits." (Saheeh Muslim)
As Islam is not a mere religion but a complete way of life, incorporating all of its various facets and aspects, good manners is actually regarded as a means of worship by which one may achieve the same reward of doing other more obvious voluntary acts of worship. The Prophet, may the mercy and blessings of God be upon him, stated:
"Through his manners and good conduct, the believer can attain the status of a person who frequently fasts and prays at night." (Abu Dawud)
Rather, the Prophet even stated it to be one of the best forms of worship, second to none but the obligatory mandates of Islam:
"On the Day of Resurrection, nothing will be heavier in the scale (of good deeds) of the believer than good conduct. God hates the one who swears and hurls obscenities." (Abu Dawud, Al-Tirmidhi)
Through maintaining good conduct, one becomes one of the beloved servants of God. The Prophet said:
"The most beloved slaves of God to God are those who have the best manners." (Al-Hakim)
When one realizes the importance of good character and its essentiality in defining righteousness, an aspect which is the goal of Islam, this exhorts Muslims to fulfill this aspect of faith as well, since one can not become "righteous" through mere belief and devotion to God in themselves without good character.
But what is regarded as good character? We find that the Quran and Sunnah in various texts define it to be any trait that is beneficial to humans, both to oneself as well as to others, at the same time not being generally or specifically prohibited by Islam. For example, God says:
"Those who suppress their anger, and forgive other people – assuredly, God loves those who do good." (Quran 3:134)
Righteousness is dealing fairly, justly and politely with one’s family. The Prophet said:
"The believers with the most perfect faith are those with the most perfect conduct and manners. And the best ones amongst you are those who are best to their families." (Al-Tirmidhi)
Truthfulness is an essential aspect of good character which leads to Paradise. The Prophet said:
"Indeed truthfulness is righteousness, and indeed righteousness leads to Paradise." (Saheeh Muslim)
For this reason, we look to divine guidance in order to define for us good manners and character, exemplified by the Prophet,
as God said:
"Surely, you (O Muhammad) are upon a high standard of moral character." (Quran 68:4)
God also said:
"Indeed in the Messenger of God you have a beautiful example of conduct to follow…" (Quran 33:21)
Aisha, the wife of the noble Prophet, was asked about his character. She replied:
"His character was that of the Quran." (Saheeh Muslim, Abu Dawud)
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