رِيَاضُ الصَّالِحِينَ
Riyad as-Salihin 589
The Book of Miscellany
Leading an Abstemious Life and refraining from the Doubtful
وَعَنْ اَلنَوَّاسِ بْنِ سَمْعَانَ رَضِيَ اللَّه عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّه عَلَيْهِ وَسَلَّمَ قَالَ: الْبِرُّ حُسْنُ الْخُلُقِ، وَالإِثْمُ مَا حَاكَ فى نَفْسِكَ، وَكَرِهْتَ أَنْ يَطَّلِعَ عَلَيْهِ النَّاسُ” ((رَوَاهُ مُسْلِم)).
An-Nawwas bin Sam'an (May Allah be pleased with him) reported: The Prophet (ﷺ) said, "Piety is good manner, and sin is that which creates doubt and you do not like people to know of it." [Muslim].
Riyad as-Salihin, 589