What is the ruling on a woman who vowed that if her husband married another woman and then died before her, she would shave her head?

The questioner : Today, by mentioning one of the brothers in front of you, he says, if Allah wills, he will come to me.The Shaykh : Muhammad al-Albani says, if you please, ask him for us. There was a disagreement between me and my wife; they said the voices were raised, and I said I wanted to marry another woman. She made a vow and an oath upon me: if you do not die before I shave my head.

The Shaykh : How?

The questioner : She made a vow and an oath, but only if her husband dies, that she would shave her head. And then she retracted it. I do not know how to express my state. What should I say? I apologized to her, and she said, "I am sorry." Is it obligatory for her to fulfill her vow?

The Shaykh : Now, the question centers on her vow?

The questioner : Yes.

The Shaykh : Yes, her saying she would shave her head is an allusion to her joy at her husband's death?

The questioner : Yes, let her offer expiation, if the expiation is that if he dies.

The Shaykh : If her husband dies before her, and she does not intend to dye her hair, she must offer expiation. But if she dies before her husband, then she is gone, and her expiation is gone.

The questioner : What is the expiation?
The Shaykh: The expiation? Do you not ask about the expiation?

The Shaykh : If her husband dies, it is permissible for her to die before him, do you understand? But generally, the brother here asked about his question earlier, and we said he must offer expiation. The expiation is for an oath a person swears, then sees that something else is better than it, so he does not do what he swore to, and he offers expiation for his oath, which is feeding ten poor people.