The Book of the Believer · Hadith 190 (#Ḥadīth #20)
Chapter 8 | What Allah (azwj) has Forbidden a Believer to do Against a Fellow Believer
190 - عن عبد الله بن سنان قال: قلت لأبي عبد الله عليه السلام: عورة المؤمن على المؤمن حرام؟ قال: نعم، قلت: يعني سبيليه؟ فقال: ليس حيث تذهب، إنما هو إذاعة سره.
190. It has been narrated that 'Abd Allah ibn Sinan said: I said to Abu 'Abd Allah , 'it is true that believers are forbidden from exposing other believers, is it not?' 'Yes, it is' he replied. 'Does this mean physical nakedness?' I asked. 'No, it is not,' he replied, 'rather it refers to disclosing his secrets.'
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).