When someone sees people conversing secretly, he should not enter where they are

Al-Adab Al-Mufrad · Book 47 · Hadith 1166

حَدَّثَنَا مُحَمَّدٌ، قَالَ‏:‏ أَخْبَرَنَا عَبْدُ اللهِ، قَالَ‏:‏ أَخْبَرَنَا دَاوُدُ بْنُ قَيْسٍ قَالَ‏:‏ سَمِعْتُ سَعِيدًا الْمَقْبُرِيَّ يَقُولُ‏:‏ مَرَرْتُ عَلَى ابْنِ عُمَرَ، وَمَعَهُ رَجُلٌ يَتَحَدَّثُ، فَقُمْتُ إِلَيْهِمَا، فَلَطَمَ فِي صَدْرِي فَقَالَ‏:‏ إِذَا وَجَدْتَ اثْنَيْنِ يَتَحَدَّثَانِ فَلاَ تَقُمُّ مَعَهُمَا، وَلاَ تَجْلِسْ مَعَهُمَا، حَتَّى…

Sa'id al-Maqburi said, "I passed by Ibn 'Umar who had a man with him with whom he was conversing. I went to them, and he struck me on the chest and said, 'When you find two men conversing, do not go up to them nor sit wi…

Al-Adab Al-Mufrad · Book 47 · Hadith 1167

حَدَّثَنَا مُحَمَّدُ بْنُ سَلاَمٍ، قَالَ‏:‏ أَخْبَرَنَا عَبْدُ الْوَهَّابِ الثَّقَفِيُّ، قَالَ‏:‏ حَدَّثَنَا خَالِدٌ، عَنْ عِكْرِمَةَ، عَنِ ابْنِ عَبَّاسٍ قَالَ‏:‏ مَنْ تَسَمَّعَ إِلَى حَدِيثِ قَوْمٍ وَهُمْ لَهُ كَارِهُونَ، صُبَّ فِي أُذُنِهِ الْآنُكُ‏.‏ وَمَنْ تَحَلَّمَ بِحُلْمٍ كُلِّفَ أَنْ يَعْقِدَ شَعِيرَةً‏.‏

Ibn 'Abbas said, "Whoever listens to people's conversations when they do not want him to do so will have molten lead poured into his ears. Anyone who lies about a dram will be obliged to string a barley bead."