Jami' al-Saghir / Jam' al-Jawami' (al-Suyuti) 20718a
"مَنِ اُغْتِيبَ عِنْدَهُ أَخُوهُ الْمُسْلِمُ فَلَمْ يَنْصُرْه وَهُوَ يَسْتَطِيعُ نصْرَهُ أَذَلَّهُ اللهُ - تَعَالى - في الدُّنْيَا وَالآخِرَةِ".
Translation
Machine translation, not reviewed
"Whoever has his Muslim brother backbitten in his presence and does not defend him while he is able to defend him, Allah, the Exalted, will humiliate him in this world and the Hereafter."
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Notes
ابن أَبي الدنيا في ذم الغيبة عن أَنس
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