In the name of Allah, Most Gracious, Most Merciful.
An-Nawwas bin Sam’an (MAPH) reported: The Prophet (SAWS) said: “Piety is good manner, and sin is that which creates doubt and you do not like people to know of it.” [Muslim]
Wabisah bin Ma’bad (MAPH) reported: “I went to Messenger of Allah (SAWS) and he asked me: “Have you come to inquire about piety?” I replied in the affirmative. Then he said: “Ask your heart regarding it. Piety is that which contents the soul and comforts the heart, and sin is that which causes doubts and perturbs the heart, even if people pronounce it lawful and give you verdicts on such matters again and again.” [Ahmad and Ad-Darmi]
SAWS: May Allah exalt his mention and protect him from imperfection
MAPH: May Allah be pleased with him
Islam lays much importance on courteous behavior and also explains and stresses its different aspects. To meet people cheerfully, to avoid causing trouble to them, rather to try to make things convenient and comfortable to them, to do social service, to extend co-operation to others in good things and to be generous, and to like for others also that you like for yourself, are all forms of moral behaviour that are counted as virtues in Islam. All that is bad and vicious is considered by Islam as sinful. This Hadith describes two signs of sin. First, man should feel scruples in committing it. Second, one does not like others being informed about it. The Hadith further tells us that human nature (fitra) leads man to correct conclusions and keeps away from evils, provided it has not been deformed by the environment and bad company.
There are two points about the 2nd Hadith. First, it is one of the miracles of the Messenger of Allah (SAWS) who discovered the nature of the question before it was put to him. Second, man’s heart is the biggest guide to him and he, therefore, should keep his heart illuminated with the light of Faith so as to continue receiving guidance from it.
Riyaadiss-Saliheen (The Meadows of the Righteous)
By Imam An Nawawi
Hadith 1: Chapter 68, Page 193, No 590
Hadith 2: Chapter 68, Page 193, No 591