Question 9: I proposed to a woman and agreed with her father to pay a Mahr (mandatory gift to a bride from her groom) of thirty-five thousand riyals. After the contract of marriage was concluded, I was shocked that my father-in-law requested from me a sum of eighty-five thousand riyals as Mahr. I refused such a request and problems continued between my father-in-law and me for one full year. I took an oath not to pay more than fifty-five thousand riyals, but unfortunately, my father-in-law did not agree and insisted that the Mahr had to be eighty-five thousand riyals. Nevertheless, I repeatedly took oaths not to pay the requested sum. So benevolent people intervened and reconciled between my father-in-law and me, where I had to pay seventy-thousand riyals. I told them about my oaths and that I could not breach them but they compelled me to pay the seventy-thousand riyal. I paid the money to avoid any further problems since they have already lasted for one year and two months. Please provide me with your beneficial Fatwa (legal opinion issued by a qualified Muslim scholar) regarding the oaths that I took, bearing in mind that I took such oaths by saying, “I swear by Allaah the Almighty…”, “By Allaah! It is unlawful for me” and “By Allaah, the number of creatures there are between the heavens and earth” that I will not pay more than the sum of fifty-five thousand riyals. Nevertheless, I did not fulfill my oaths. Please answer me. Best Regards.
Answer: If the reality is as you mentioned, you have to make one Kaffaarah (expiation) for your multiple oaths and it will be sufficient for all of them… read more here.