from entering the house unless she was informed. Since you did in fact admit him without her knowledge, she has broken her oath and the expiation is now obligatory upon her.
Question: Does this same ruling apply in every case where a wife pronounces herself forbidden to her husband—that it is treated as the expiation for an oath?
Answer: Yes. This is the soundest view among the scholars. If a woman performs ẓihār with respect to her husband, or otherwise declares him unlawful to herself, the correct ruling is that she must pay the expiation for an oath.
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Expiation for repeated oaths
Question: A person swears that he will not do something, then does it; he swears again, then does it—and perhaps a third time. What is the ruling? Is one expiation enough, or are several required?
Answer: If he repeats several oaths by the name of Allah concerning the same matter before offering any expiation, one expiation suffices for all of them. But if he swears, expiates, and thereafter swears again about the same matter, then a second expiation is due, and so on.
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The yameen ghamoos (the plunging oath)
Question: What is the yameen ghamoos?
Answer: The yameen ghamoos is an oath in which a person swears about a past event while knowingly lying—for example, asserting that such-and-such happened or that such-and-such was the case when he knows it is untrue.