Two persons should not talk privately ignoring the third, for that will grieve him.
قَالَ رَسُولُ اللَّهِ ﷺ لاَ يَنْتَجِي اثْنَانِ دُونَ الثَّالِثِ فَإِنَّ ذَلِكَ يُحْزِنُهُ
"The Messenger of Allah ﷺ forbade two to converse (privately) to the exclusion of a third."
نَهَى رَسُولُ اللَّهِ ﷺ أَنْ يَتَنَاجَى اثْنَانِ دُونَ الثَّالِثِ
"When you are three, two should not converse (privately) to the exclusion of their companion, because that makes him sad." (Using translation from Ibn Mājah 3775)
قَالَ رَسُولُ اللهِ ﷺ إِذَا كُنْتُمْ ثَلَاثَةً فَلَا يَتَنَاجَ اثْنَانِ دُونَ وَاحِدٍ فَإِنَّ ذَلِكَ يُحْزِنُهُ
Two persons should not talk privately ignoring the third, for that will grieve him. (Using translation from Abū Dāʾūd 4851)
قَالَ رَسُولُ اللهِ ﷺ لَا يَنْتَجِي اثْنَانِ دُونَ صَاحِبِهِمَا فَإِنَّ ذَلِكَ يُحْزِنُهُ
[Machine] The Prophet ﷺ said, "When three people gather together, two should not engage in private conversation to the exclusion of the third, as this would grieve him."
قَالَ النَّبِيُّ ﷺ «إِذَا اجْتَمَعَ ثَلَاثَةٌ فَلَا يَتَنَاجَى اثْنَانِ دُونَ الثَّالِثِ؛ فَإِنَّ ذَلِكَ يُحْزِنُهُ»
Request/Fix translation
"لَا يَنْتَجِي اثْنَانِ دُونَ الثَّالِث؛ فَإِنَّ ذَلِكَ يُحْزِنُهُ".