Muwatta Malik #1951
Speech
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ
" إِذَا كَانَ ثَلاَثَةٌ فَلاَ يَتَنَاجَى اثْنَانِ دُونَ وَاحِدٍ " .
Malik related to me from Nafi from Abdullah ibn Umar that the
Messenger of Allah, may Allah bless him and grant him peace, said,
"Two must not converse secretly to the exclusion of another person."
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About Muwatta Malik
This hadith is #1951 from Muwatta Malik, in the Book of Speech.