The ruling on one who says to his wife: If you do such-and-such, you will be divorced

Question: A questioner says: I said to my wife, while I was in a state of extreme anger: If you do such-and-such, you will be divorced. This was with the intention of threatening and preventing her, not with the intention of divorcing her. Knowing that she did not do it, what is the expiation for this oath? And if she had done it, would she be divorced?

Answer: If a man says to his wife: If you do such-and-such, you are divorced, or if you do such-and-such, you are divorced; and his intention is to threaten and warn her, not to effect the divorce, but rather his intention is to frighten and warn her, then the correct view, according to the most precise scholars, is that this is ruled as an oath. He owes the expiation of an oath if she does it. As for if she does not do it, he owes nothing. But when she defies him and does it, she has erred and disobeyed, and he owes the expiation of an oath if she does it.
And if he says: If you stand up to do such-and-such, or if you visit the family of so-and-so, or if you attend such-and-such a wedding; and his intention is to threaten and frighten her, but she does not comply, rather she defies him, then she has committed a sin, and he owes the expiation of an oath, and she owes repentance; for she has committed a sin by defying her husband in what is right. May Allah guide them all.