Swearing during a fit of anger

Q: One of my relatives proposed to my sister but I swore by Allah not to give her to him in marriage because of former disputes between our fathers - may Allah be merciful with them and all Muslims. It should be mentioned that my sister wanted to marry him, and the whole family approved of this marriage. However, Allah turned Satan away from me - May Allah guard us from his accompaniment - and I gave my sister to this man in marriage according to Allah's Shari`ah (Islamic law) and the Sunnah of His Messenger (peace be upon him). Does it suffice to fast for three days (Part No. 23; Page No. 71) or to feed sixty needy people as a Kaffarah (expiation)?

A: If the reality is as you have mentioned, you must offer a Kaffarah for a broken oath, which is feeding ten needy people or clothing them, or freeing a believing slave, and if you do not find, you should fast for three days, and it is preferable that you fast them consecutively.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.