Al-Kāfi

Hadith 601
fastingwomenmarriage
4ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ الْحَسَنِ بْنِ مَحْبُوبٍ عَنْ مَالِكِ بْنِ عَطِيَّةَ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلاَم) قَالَ قَالَ النَّبِيُّ (صلَّى اللهُ عَلَيْهِ وَآلِه) لَيْسَ لِلْمَرْأَةِ أَنْ تَصُومَ تَطَوُّعاً إِلاَّ بِإِذْنِ زَوْجِهَا.
4. A number of our people have narrated from Ahmad ibn Muhammad from al-Hassan ibn Mahbub from Malik ibn ‘Atiyyah from Muhammad ibn Muslim who has said the following: “Abu Ja‘far (a.s.), has said that a woman must not optionally fast without permission from her husband.”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī