The ruling on one who swears not to do something and then does it

One of the listening sisters, who indicated her name with the letters (A. A. K), said in one of her questions: I swore by Allah that I would never do a specific action, but I did it. After a period of time, I fulfilled my oath and left this action. Does this mean that I have fulfilled the oath, or is there something required of me? May Allah reward you with good.
Answer: You owe an expiation; because you did it, you owe the expiation for an oath. If you say, "By Allah, I will not talk to so-and-so," or "By Allah, I will not talk to so-and-so (female)," or "By Allah, I will not eat the food of so-and-so" or "the food of so-and-so (female)," or "I will not visit them," and then you do it, you owe the expiation for an oath. Even if you leave it off after that, you owe an expiation for the action you performed after the oath. This is feeding ten poor people, or clothing ten poor people, where each person is given half a sa' (a dry measure of about 3 kg) of dates or rice from the staple food of the country, the amount of which is approximately one and a half kilograms, or clothing them with clothing that is sufficient for prayer, such as a shirt, a lower garment, or a cloak, or freeing a slave. So whoever is unable and cannot do these things, it is sufficient for him to fast three days in the case of inability and poverty. Yes.
The presenter: May Allah reward you with good.