Narrator:Abdullah ibn Mas‘ūd
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."
Reported by Ibn Majah (No. 3775), Muslim (No. 2184b, 2184c), Abu Dawud (No. 4851), At-Tirmidhi (No. 2825), Ahmad (No. 3379, 3834, 3835, 3884, 3961, 3975, 4175, 4192) and Ad-Darimi (No. 2542).