Swearing to fast for a month and seven days if she passes the school exams

Q: My daughter swore by Allah to fast one month and seven days if she passed her exams. Should she observe Sawm (fasting) for one month and seven days successively or make expiation for it? Please advise us. May Allah protect you.

A: It is obligatory upon your daughter to fulfill her oath, since it was authentically narrated that the Prophet (peace be upon him) said, (Part No. 23; Page No. 307) Whoever vows to obey Allah should obey Him. Fasting these days successively in fact depends on her intention, and if she gave her oath generally without specification, she should fast these days successively as a precaution.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.