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 ﷺ قال: "لا يحل للمرأة أن تصوم وزوجها شاهد إلا بإذنه، ولا تأذن في بيته إلا بإذنه" ((متفق عليه)).