Vowing to pay Sadaqah if he passes the exams

Q: I am a student in the second year of the preparatory stage. I made a vow that if I succeed this year and move to the third preparatory year, I will give a Sadaqah (voluntary charity) for the sake of Allah, but I failed, and I did not give Sadaqah. What is the ruling on this vow? What is the ruling on continuing my studies? Is it permissible to make a vow to observe Sawm (fasting)?

A: There is no harm in continuing your studies. If you succeed, fulfill your vow, as it is one of obedience. As for making a vow to observe Sawm, it is permissible, according to the saying of the Prophet (peace be upon him), A person who vows to obey Allah should do so. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.