Full Sharh — Mishkat al-Masabih 3062
وَعَنْ أَبِي سَعِيدٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِنَّ أَعْظَمَ الْأَمَانَةِ عِنْدَ اللَّهِ يَوْمَ الْقِيَامَةِ " وَفِي رِوَايَةٍ: إِنَّ مِنْ أَشَرِّ النَّاسِ عِنْدَ اللَّهِ مَنْزِلَةً يَوْمَ الْقِيَامَةِ الرَّجُلُ يُفْضِي إِلَى امْرَأَتِهِ وَتُفْضِي إِلَيْهِ ثمَّ ينشر سرها ". رَوَاهُ مُسلم
English Translation
Abu Sa'id al-Khudri reported God's Messenger as saying, “The most serious breach of trust in God’s sight on the day of resurrection ...” A version has, “Among those who will have the worst position in God’s sight on the day of resurrection is the man who has intercourse with his wife, and she with him, and then spreads her secret.”* * i.e. talks about the subject to others, or tells people about defects or beauties he has found in her. Muslim transmitted it.
Source
Mishkat al-Masabih(مشكاة المصابيح)
Marriage
Hadith Number
3062