Riyad as-Salihin 1750
Abu Hurairah (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "It is not lawful for a woman to observe an optional Saum (fast) without the permission of her husband when he is at home. Nor should she allow anyone to enter his house without his permission." [Al-Bukhari and Muslim] .
عن أبي هريرة رضي الله عنه أن رسول الله صلى الله عليه وسلم  قال‏:‏ ‏
"‏لا يحل للمرأة أن تصوم وزوجها شاهد إلا بإذنه، ولا تأذن في بيته إلا بإذنه‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏‏.‏