Hadithcore
Sahih Muslim, 2183 a
sahih

Ibn Umar reported Allah's Messenger (ﷺ) as saying:

When there are three (persons), two should not converse secretly between themselves to the exclusion of the (third) one.

حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏

‏ إِذَا كَانَ ثَلاَثَةٌ فَلاَ يَتَنَاجَى اثْنَانِ دُونَ وَاحِدٍ ‏

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References2 variants
In-Book Reference
Book 39, Hadith 48
USC-MSA web (English) reference
Book 26, Hadith 5419 (deprecated numbering scheme)
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