Al-Adab Al-Mufrad 314

The believer is not a defamer

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حَدَّثَنَا عَمْرُو بْنُ مَرْزُوقٍ قَالَ أَخْبَرَنَا شُعْبَةُ عَنْ أَبِي إِسْحَاقَ عَنْ أَبِي الأَحْوَصِ عَنْ عَبْدِ اللهِ قَالَ

أَلأَمُ أَخْلاَقِ الْمُؤْمِنِ الْفُحْشُ

Translation

'Abdullah said, "The most blameworthy thing in a believer's character is coarseness."

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al-Albani	Sound	hadithunlocked, sunnah.com