Jami` at-Tirmidhi 782
جامع الترمذي#782SahihAbu Hurairah narrated that:The Prophet said: "A woman may not fast a day - other than in the month of Ramadan - while her husband is present, except with his permission
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Bukhari And Muslim
In-book reference: 8:101