When someone has love for a person, he should not quarrel with him nor ask about him Al-Adab Al-Mufrad 545
Arabic hadith text
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.
Translation
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."