Sahih al-Bukhari 6492
Sahih al-Bukhari · Book 81: To make the Heart Tender (Ar-Riqaq) · What minor sins should be warded off
Narrated Ghailan:
حَدَّثَنَا أَبُو الْوَلِيدِ ، حَدَّثَنَا مَهْدِيٌّ ، عَنْ غَيْلاَنَ ، عَنْ أَنَسٍ ـ رضى الله عنه ـ قَالَ إِنَّكُمْ لَتَعْمَلُونَ أَعْمَالاً هِيَ أَدَقُّ فِي أَعْيُنِكُمْ مِنَ الشَّعَرِ، إِنْ كُنَّا نَعُدُّهَا عَلَى عَهْدِ النَّبِيِّ صلى الله عليه وسلم الْمُوبِقَاتِ. قَالَ أَبُو عَبْدِ اللَّهِ يَعْنِي بِذَلِكَ الْمُهْلِكَاتِ .
Anas said "You people do (bad) deeds (commit sins) which seem in your eyes as tiny (minute) than hair while we used to consider those (very deeds) during the life-time of the Prophet (ﷺ) as destructive sins."