The Ruling on Intention in Making Up the Fast of an Obligation

Question:
This is a man who says: "I am fasting today until this 'Asr prayer," and he says: "I have three days of obligatory fasts that I have not fasted, and I did not intend this fast of mine from last night." So what is the ruling on my fasting until 'Asr?

Answer:
Voluntary prayer.
Q: Yes, it is a voluntary fast, but he has three days of obligatory fasts that he has not fasted?
A: It is a sunnah (recommended practice), a voluntary fast, and he has a choice: if he wishes, he fasts, and if he wishes, he breaks the fast, and praise be to Allah. It is obligatory for him to prioritize the obligatory fast.
Q: Does this day drop off based on the saying of the Messenger of Allah (peace and blessings be upon him) to Shubrumah: ?
A: This is regarding Hajj: .
Q: Is the generality applicable to all obligations?
A: In any case, if he breaks the fast, the matter is broad, and if he completes it and only a little remains, there is no harm.
Q: Is it a voluntary fast?
A: But he should not fast anything other than this; he should start with the obligatory fast until he frees himself from the obligation, then he may perform voluntary fasts.
Q: Is his day valid?
A: It is hoped for him; because this man is ignorant.