What is the ruling if one swears an oath to break their fast during the day in Ramadan?

Fasting Ramadan is obligatory for every Muslim who is adult, sane, resident, and able. It is forbidden to break the fast without a valid excuse. If a Muslim swears an oath to commit a sin, such as breaking the fast in Ramadan, he is not permitted to fulfill his oath. Rather, he must break it and pay expiation for the oath. The expiation for an oath is feeding ten needy persons, or clothing them, or emancipating a slave. If he cannot find any of these, then he must fast three days. Furthermore, whoever does this must repent to Allah, because deliberately breaking the fast in Ramadan without a valid excuse indicates a serious disregard for Allah's sacred injunctions.