Asma’ bint Yazid reported: The Prophet, peace and blessings be upon him, said, “Shall I not tell you about the best of you?” They said, “Of course.” The Prophet said, “Those who, if they are seen, they remind you of Allah. Shall I not tell you about the worst of you?” They said, “Of course.” The Prophet said, “Those who carry gossip and ruin relations between loved ones, seeking misery for the innocent.”
Source: al-Adab al-Mufrad 321
Grade: Hasan (fair) according to Al-Albani
عَنْ أَسْمَاءَ بِنْتِ يَزِيدَ قَالَتْ قَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَلا أُخْبِرُكُمْ بِخِيَارِكُمْ قَالُوا بَلَى قَالَ الَّذِينَ إِذَا رُءُوا ذُكِرَ اللَّهُ أَفَلا أُخْبِرُكُمْ بِشِرَارِكُمْ قَالُوا بَلَى قَالَ الْمَشَّاؤُونَ بِالنَّمِيمَةِ الْمُفْسِدُونَ بَيْنَ الأَحِبَّةِ الْبَاغُونَ الْبُرَآءَ الْعَنَتَ
321 الأدب المفرد للبخاري باب النمام
246 المحدث الألباني خلاصة حكم المحدث حسن في صحيح الأدب المفرد