Al-Kāfi

Hadith 2312
neighborsbackbiting-slander
15ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ فَضَّالٍ عَنْ أَبِي جَمِيلَةَ عَنْ سَعْدِ بْنِ طَرِيفٍ عَنْ أَبِي جَعْفَرٍ (عَلَيهِ السَّلام) قَالَ مِنَ الْقَوَاصِمِ الْفَوَاقِرِ الَّتِي تَقْصِمُ الظَّهْرَ جَارُ السَّوْءِ إِنْ رَأَى حَسَنَةً أَخْفَاهَا وَإِنْ رَأَى سَيِّئَةً أَفْشَاهَا.
15. A number of our people have narrated from Ahmad ibn Muhammad from ibn Faddal from abu Jamilah from Sa’d ibn Tarif from abu Ja’far (a.s.) who has said the following: “Of the back-breaking misfortunes, one is a bad neighbor who hides all good things about his neighbor and publicizes all the bad things about him.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī