وَعَنْ أَبِي هُرَيْرَةَ رضى الله عنه
أَنَّ رَسُولَ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لَا يَحِلُّ لِلْمَرْأَةِ أَنْ تَصُومَ وَزَوْجُهَا شَاهِدٌ إِلَّا بِإِذْنِهِ»
The Messenger of Allah (sallallahu alayhi wa sallam) said, “A woman is not to fast (even) for one day while her husband is present except with his permission” Agreed upon and the wording is from Al-Bukhari. Abu Dawud’s version states, “unless it is during Ramadan (then she does not need his permission as it is obligatory fasting).”
Bulugh al-Maram 793, Book 5, Fasting, Hadith 36. 1 min read