alkafi-3712Vol. 2, p. 660
إِذَا كَانَ الْقَوْمُ ثَلَاثَةً فَلَا يَتَنَاجَى مِنْهُمُ اثْنَانِ دُونَ صَاحِبِهِمَا فَإِنَّ فِي ذَلِكَ مَا يَحْزُنُهُ وَ يُؤْذِيهِ.
“Out of three people, two of them should not hold a private conversation because it saddens and hurts the feelings of the third.”