Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrated that the Noble Prophet (peace and blessings be upon him) said to a woman: "Do not fast without your husband's permission."
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "A woman should not observe even a single voluntary fast, apart from Ramadan, in the presence of her husband without his permission."
It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "If the husband is present, a woman should not observe even a single voluntary fast without his permission." He said: "She should fulfill the fast of vow."