سُنَنُ ابْنِ مَاجَهْ
Sunan Ibn Majah 3775
Etiquette
Two should not converse to the exclusion of a third
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللَّهِ بْنِ نُمَيْرٍ، حَدَّثَنَا أَبُو مُعَاوِيَةَ، وَوَكِيعٌ، عَنِ الأَعْمَشِ، عَنْ شَقِيقٍ، عَنْ عَبْدِ اللَّهِ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ إِذَا كُنْتُمْ ثَلاَثَةً فَلاَ يَتَنَاجَى اثْنَانِ دُونَ صَاحِبِهِمَا فَإِنَّ ذَلِكَ يُحْزِنُهُ .
It was narrated from Abdullah that the Messenger of Allah(ﷺ) said: "When you are three, two should not converse (privately) to the exclusion of their companion, because that makes him sad."
Sunan Ibn Majah, 3775Sahih (Darussalam)