Regarding backbiting (al-ghibah)
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا الأَسْوَدُ بْنُ عَامِرٍ، حَدَّثَنَا أَبُو بَكْرِ بْنُ عَيَّاشٍ، عَنِ الأَعْمَشِ، عَنْ سَعِيدِ بْنِ عَبْدِ اللَّهِ بْنِ جُرَيْجٍ، عَنْ أَبِي بَرْزَةَ الأَسْلَمِيِّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " يَا مَعْشَرَ مَنْ آمَنَ بِلِسَانِهِ وَلَمْ يَدْخُلِ الإِيمَانُ قَلْبَهُ لاَ تَغْتَابُوا الْمُسْلِمِينَ وَلاَ تَتَّبِعُوا عَوْرَاتِهِمْ فَإِنَّهُ مَنِ اتَّبَعَ عَوْرَاتِهِمْ يَتَّبِعِ اللَّهُ عَوْرَتَهُ وَمَنْ يَتَّبِعِ اللَّهُ عَوْرَتَهُ يَفْضَحْهُ فِي بَيْتِهِ " .
Narrated AbuBarzah al-Aslami: The Prophet (ﷺ) said: O community of people, who believed by their tongue, and belief did not enter their hearts, do not back-bite Muslims, and do not search for their faults, for if anyone searches for their faults, Allah will search for his fault, and if Allah searches for the fault of anyone, He disgraces him in his house.