Sahih al-Bukhari 5192
Sahih al-Bukhari · Book 67: Wedlock, Marriage (Nikaah) · A woman should not observe Saum except husband's consent (is 'with her' missing here?)
Narrated Abu Huraira:
حَدَّثَنَا مُحَمَّدُ بْنُ مُقَاتِلٍ ، أَخْبَرَنَا عَبْدُ اللَّهِ ، أَخْبَرَنَا مَعْمَرٌ ، عَنْ هَمَّامِ بْنِ مُنَبِّهٍ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم " لاَ تَصُومُ الْمَرْأَةُ وَبَعْلُهَا شَاهِدٌ إِلاَّ بِإِذْنِهِ " .
The Prophet (ﷺ) said, "A woman should not fast (optional fasts) except with her husband's permission if he is at home (staying with her).