Malik related to me from Abdullah ibn Dinar saying, "Abdullah ibn Umar and I were at the house of Khalid ibn Uqba who was away at the market. A man came who wanted to speak to Abdullah ibn Umar and I was the only other person present Abdullah ibn Umar called another man so that we were four and said to me and the man whom he had called, 'Go a little way off together, because I heard the Messenger of Allah ﷺ say, "Two do not converse secretly to the exclusion of another.' "'  

قَالَ كُنْتُ أَنَا وَعَبْدُ اللَّهِ بْنُ عُمَرَ عِنْدَ دَارِ خَالِدِ بْنِ عُقْبَةَ الَّتِي بِالسُّوقِ فَجَاءَ رَجُلٌ يُرِيدُ أَنْ يُنَاجِيَهُ وَلَيْسَ مَعَ عَبْدِ اللَّهِ بْنِ عُمَرَ أَحَدٌ غَيْرِي وَغَيْرُ الرَّجُلِ الَّذِي يُرِيدُ أَنْ يُنَاجِيَهُ فَدَعَا عَبْدُ اللَّهِ بْنُ عُمَرَ رَجُلاً آخَرَ حَتَّى كُنَّا أَرْبَعَةً فَقَالَ لِي وَلِلرَّجُلِ الَّذِي دَعَاهُ اسْتَأْخِرَا شَيْئًا فَإِنِّي سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لاَ يَتَنَاجَى اثْنَانِ دُونَ وَاحِدٍ