What should one do who swore to her fiancé before his death, “I will lose my worldly life and my religion if I marry after him,” and now wishes to marry after three years have passed since his death?

The husband erred by asking his wife not to marry after him, and this condition is void because it lacks a legitimate purpose. The wife erred in several aspects: Firstly, her oath to lose her religion and her worldly life, which is an impermissible oath. Secondly, her oath to refrain from marriage without a legitimate justification; she should have broken her oath and married. The wording she used for her oath is not a [binding] oath, and she is not required to offer expiation for it, according to the more sound opinion. Thirdly, her refusal to marry for three years, thereby contravening the command of Allah and His Messenger regarding marriage. In summary, she is not bound by what she pledged to her husband, and she is not required to offer expiation if she marries.