Al-Adab Al-Mufrad #1172
Behaviour with people
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ قَالَ: حَدَّثَنِي أَبِي، قَالَ: حَدَّثَنَا الأَعْمَشُ قَالَ: حَدَّثَنِي شَقِيقٌ، عَنْ عَبْدِ اللهِ قَالَ: قَالَ النَّبِيُّ صلى الله عليه وسلم: إِذَا كُنْتُمْ ثَلاَثَةً فَلاَ يَتَنَاجَى اثْنَانِ دُونَ الثَّالِثِ، فَإِنَّهُ يُحْزِنُهُ ذَلِكَ.
'Abdullah reported that the Prophet, may Allah bless him and grant
him peace, said, "When there are three people, two should not converse
together to the exclusion of the third for that would grieve him."
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About Al-Adab Al-Mufrad
This hadith is #1172 from Al-Adab Al-Mufrad, in the Book of Behaviour with people.