Al-Kāfi - Volume 2 > Safe Guarding the Trust of a Meeting
Hadith #3

3ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنْ عُثْمَانَ بْنِ عِيسَى عَمَّنْ ذَكَرَهُ عَنْ أَبِي عَبْدِ الله (عَلَيهِ السَّلام) قَالَ الْمَجَالِسُ بِالأمَانَةِ وَلَيْسَ لأحَدٍ أَنْ يُحَدِّثَ بِحَدِيثٍ يَكْتُمُهُ صَاحِبُهُ إِلا بِإِذْنِهِ إِلا أَنْ يَكُونَ ثِقَةً أَوْ ذِكْراً لَهُ بِخَيْرٍ.

3. A number of our people have narrated from Ahmad ibn Muhammad ibn Khalid from ‘Uthman ibn ‘Isa from those whom he has mentioned (in his book) from abu ‘Abd Allah (a.s.) who has said the following: “The meetings are trusts. No one must make public anything that one’s companion does not want to be made public unless it is with his permission, or he is trusted and does it only for his good.”