Regarding backbiting (al-ghibah)
حَدَّثَنَا ابْنُ الْمُصَفَّى، حَدَّثَنَا بَقِيَّةُ، وَأَبُو الْمُغِيرَةِ، قَالاَ حَدَّثَنَا صَفْوَانُ، قَالَ حَدَّثَنِي رَاشِدُ بْنُ سَعْدٍ، وَعَبْدُ الرَّحْمَنِ بْنُ جُبَيْرٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لَمَّا عُرِجَ بِي مَرَرْتُ بِقَوْمٍ لَهُمْ أَظْفَارٌ مِنْ نُحَاسٍ يَخْمِشُونَ وُجُوهَهُمْ وَصُدُورَهُمْ فَقُلْتُ مَنْ هَؤُلاَءِ يَا جِبْرِيلُ قَالَ هَؤُلاَءِ الَّذِينَ يَأْكُلُونَ لُحُومَ النَّاسِ وَيَقَعُونَ فِي أَعْرَاضِهِمْ " . قَالَ أَبُو دَاوُدَ حَدَّثَنَاهُ يَحْيَى بْنُ عُثْمَانَ عَنْ بَقِيَّةَ لَيْسَ فِيهِ أَنَسٌ .
Narrated Anas ibn Malik: The Prophet (ﷺ) said: When I was taken up to heaven I passed by people who had nails of copper and were scratching their faces and their breasts. I said: Who are these people, Gabriel? He replied: They are those who were given to back biting and who aspersed people's honour. Abu Dawud said: Yahya b. 'Uthman has also transmitted it from Baqiyyah, there is no mention of Anas in it.