What is the ruling regarding a husband who said to his wife, "You are unlawful to me if you go to your family tomorrow," and then in the evening permitted her to go? Does she become unlawful to him?

If a husband conditioned his wife's divorce on her going to her family's home tomorrow, and then, on the evening of that 'tomorrow' before sunset, he gave her permission, then he has committed a breach of his oath (ḥinth). This is because, legally, a day is considered to be from dawn until sunset. After the breach, his intention behind the prohibition is considered: if he intended divorce, it becomes a divorce; if he intended ẓihār (a form of injurious divorce), it becomes ẓihār; and if he intended an oath or had no specific intention, then an expiation for a broken oath (kaffārat yamīn) becomes incumbent upon him. The husband cannot retract the aforementioned oath in a way that would negate the consequences of the breach. This is the view of the majority of scholars, in contrast to Ibn Taymiyyah, who holds that retraction is possible.