Al-Adab Al-Mufrad #318
Cursing
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ عَبْدِ اللهِ، قَالَ: حَدَّثَنَا سُلَيْمَانُ بْنُ بِلاَلٍ، عَنِ الْعَلاَءِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ النَّبِيُّ صلى الله عليه وسلم: لاَ يَنْبَغِي لِلصِّدِّيقِ أَنْ يَكُونَ لَعَّانًا.
Abu Hurayra reported that the Prophet, may Allah bless him and
grant him peace, said, "The true person must not be a curser."
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About Al-Adab Al-Mufrad
This hadith is #318 from Al-Adab Al-Mufrad, in the Book of Cursing.