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." (DE)
English reference (DE): Vol. 1, Book 7, Hadith 1761 (DE)
Arabic reference (DE): Book 7, Hadith 1833 (DE)