حَدَّثَنَا إِسْمَاعِيلُ قَالَ: حَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللهِ
أَنَّ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: إِذَا كَانُوا ثَلَاثَةً، فَلَا يَتَنَاجَى اثْنَانِ دُونَ الثَّالِثِ
Abdullah reported that the Messenger of Allah (sallallahu alayhi wa sallam), 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.”
Al-Adab Al-Mufrad 1171, Book 47, Behaviour with people, Hadith 16. 1 min read