Al-Adab Al-Mufrad #314
Cursing
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا خَالِدُ بْنُ مَخْلَدٍ، قَالَ: حَدَّثَنَا سُلَيْمَانُ بْنُ بِلاَلٍ، عَنْ عُبَيْدِ اللهِ بْنِ سَلْمَانَ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ: لاَ يَنْبَغِي لِذِي الْوَجْهَيْنِ أَنْ يَكُونَ أَمِينًا.
Abu Hurayra reported that the Prophet, may Allah bless him and
grant him peace, said, "A person who is two-faced cannot be trusted."
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About Al-Adab Al-Mufrad
This hadith is #314 from Al-Adab Al-Mufrad, in the Book of Cursing.