حَدَّثَنَا عَبْدُ اللهِ بْنُ صَالِحٍ قَالَ: حَدَّثَنِي مُعَاوِيَةُ، أَنَّ أَبَا الزَّاهِرِيَّةِ حَدَّثَهُ، عَنْ جُبَيْرِ بْنِ نُفَيْرٍ، عَنْ مُعَاذِ بْنِ جَبَلٍ أَنَّهُ قَالَ: إِذَا أَحْبَبْتَ أَخًا فَلاَ تُمَارِهِ، وَلاَ تُشَارِّهِ، وَلاَ تَسْأَلْ عَنْهُ، فَعَسَى أَنْ تُوَافِيَ لَهُ عَدُوًّا فَيُخْبِرَكَ بِمَا لَيْسَ فِيهِ، فَيُفَرِّقَ بَيْنَكَ وَبَيْنَهُ.
Mu'adh ibn Jabal said, "When you have love for your brother, do not quarrel with him or treat him badly nor ask questions about him, It may be that an enemy of his will appear and say something about him which is not true and will thereby cause a split between you."
Source: Al-Adab Al-Mufrad — repository translation · Imam Muhammad ibn Ismail al-Bukhari — authenticity/grade metadata requires independent source review · Sunnah.comAudio not available for the selected reciter.
Source: Al-Adab Al-Mufrad — repository arabic · Imam Muhammad ibn Ismail al-Bukhari · Sunnah.com