The ruling on vowing to fast on a specific day
Machine translationRead the Arabic original
Question:
He says: Shaykh, I vowed to fast on Thursday, but I was unable to fast. Is anything required of me?
Answer:
Yes, you must fast; because fulfilling a vow is obligatory, and this is a vow of obedience, so you are required to fulfill it. If the time you designated for it has passed, you must make it up, and along with making it up, you must pay an oath expiation: feed ten poor people, or clothe them, or fast for three days if you are unable to carry out this vow. Yes.
He says: Shaykh, I vowed to fast on Thursday, but I was unable to fast. Is anything required of me?
Answer:
Yes, you must fast; because fulfilling a vow is obligatory, and this is a vow of obedience, so you are required to fulfill it. If the time you designated for it has passed, you must make it up, and along with making it up, you must pay an oath expiation: feed ten poor people, or clothe them, or fast for three days if you are unable to carry out this vow. Yes.
Source
نور على الدرب - الفوزان - 02/286 — archive.org (10:31)
The Arabic text is a machine transcription of the audio recording.