It wasnarrated from Abu Hurairah that the Prophet (ﷺ) said:
"Whenherhusband is present, no woman should fast any day apart from themonthof Ramadan without his permission." (RU)
English reference (RU): Vol. 1, Book 7, Hadith 1761 (RU)
Arabic reference (RU): Book 7, Hadith 1833 (RU)