Two should not converse to the exclusion of a third
باب لاَ يَتَنَاجَى اثْنَانِ دُونَ الثَّالِثِ
Sunan Ibn Majah, Book of Etiquette(view book)
It was narrated from Abdullah that the Messenger of Allahﷺ said:
"When you are three, two should not converse (privately) to the exclusion of their companion, because that makes him sad."
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، وَوَكِيعٌ، عَنِ الأَعْمَشِ، عَنْ شَقِيقٍ، عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ ﷺ " إِذَا كُنْتُمْ ثَلاَثَةً فَلاَ يَتَنَاجَى اثْنَانِ دُونَ صَاحِبِهِمَا فَإِنَّ ذَلِكَ يُحْزِنُهُ " .
Classification
It was narrated that Ibn 'Umar said:
"The Messenger of Allahﷺ forbade two to converse (privately) to the exclusion of a third."
حَدَّثَنَا هِشَامُ بْنُ عَمَّارٍ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ، قَالَ نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يَتَنَاجَى اثْنَانِ دُونَ الثَّالِثِ .