(15) باب تَحْرِيمِ مُنَاجَاةِ الاِثْنَيْنِ دُونَ الثَّالِثِ بِغَيْرِ رِضَاهُ
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. (JA)
Reference (JA): Sahih Muslim 2183 a (JA)
In-book reference (JA): Book 39, Hadith 48 (JA)
USC-MSA web (English) reference(deprecated numbering scheme): Book 26, Hadith 5419 (JA)