Al-Adab Al-Mufrad #431
Disparaging
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا إِبْرَاهِيمُ بْنُ مُوسَى قَالَ: أَخْبَرَنِي يَحْيَى بْنُ زَكَرِيَّا بْنِ أَبِي زَائِدَةَ، عَنْ زَكَرِيَّا، عَنْ أَبِي إِسْحَاقَ، عَنْ مُحَمَّدِ بْنِ سَعْدِ بْنِ مَالِكٍ، عَنْ أَبِيهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ: سِبَابُ الْمُسْلِمِ فُسُوقٌ.
Sa'id ibn Malik reported that the Prophet, may Allah bless him
and grant him peace, said, "Reviling a Muslim is deviant behaviour."
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About Al-Adab Al-Mufrad
This hadith is #431 from Al-Adab Al-Mufrad, in the Book of Disparaging.