The One Who Breaks His Oath Must Atone for it

Question :

One day, a person closely related to me provoked me by saying: "You will take one of the daughters of so-and-so (as a wife)." I responded: "By Allah, if the daughters of so-and-so were the last women in the world, I would not marry any of them." Years passed by and I married one of them. And I am now living all praise and thanks be to Allaha happy life. 1 request you to guide me to what I should do regarding that previous oath.

Answer:

If the situation is as you have described in the question, then you must make atonement for an unfulfilled oath. That is to feed ten poor persons, or clothe them, or to free a slave. The requirement in feeding the poor is to give each of them half a Sa' of the staple food of the country, such as dates, wheat or some other thing, and that is equivalent to approximately one and a half kilograms. The clothing should be of garments suitable for praying in, such as a long shirt or a waist wrap and an upper wrap. If he is unable to feed or clothe (the poor), or to free a slave, then he must fast for three consecutive days, according to the Words of Allah, Most Glorified:

"Allah will not punish you for what is unintentional in your oaths, but He will punish you for your deliberate oaths; for its expiation (a deliberate oath) feed ten Masäkin (poor persons), on a scale of the average of that with which you feed your own families, or clothe them or manumit a slave. But whosoever cannot afford (that), then he should fast for three days. That is the expiation for the oaths when you have sworn. And protect your oaths (ie, do not swear much).

Source:
Ibn Baz
Fatawa Islamiyah, Vol. 6 Pages 382-383