I vowed to fast one day and break the fast the next, but this has prevented me from doing some matters that are more important than fasting?

Question:
A young man vowed to fast one day and break the fast the next, but this has exhausted him greatly and prevented him from doing some matters that are more important than fasting. Is it permissible for him to abandon this vow for something that has a greater reward, if Allah wills?

Answer:
No, no, there is nothing greater than performing an obligatory duty, and a vow is obligatory. So, since he vowed to fast one day and break the fast the next, he must continue with that, based on the saying of the Messenger (peace and blessings be upon him) And the fact that it is difficult for him, he should be patient with the hardship, because he is the one who bound himself to this. So, what he entered into with the vow from the beginning, but if he vows, he must fulfill it. Yes.