The fourth question of Fatwa no.9509Q 4: What is the ruling on
a person who takes an oath not to let his wife enter his house using this formula: "I swear by Allah Who is the Only God." Is it permissible for him to let her enter his house?
It is permissible for him to do so but he will have to offer a Kaffarah (expiation) for breaking his oath. A Kaffarah is feeding ten Miskins (needy persons), clothing them or freeing a Muslim slave. If he is unable to afford any of these, he will have to observe fasting for three days. However, if he intended to divorce her by this oath, she would be divorced for one time if he let her in. Then he may return to her in marriage during `Iddah (woman's prescribed waiting period after divorce or widowhood) if he has not divorced her two times before that.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.