If one intends to fast a voluntary night fast and wakes up after the dawn has appeared and drinks thinking that the night is still there, does he complete his fast?

Question:
He says: Honorable Shaykh, may Allah grant you success. If a person intends to fast a voluntary fast at night, then wakes up after the dawn has appeared and drinks, thinking that it is still night because the mosque mu'adhdhin did not call for the Fajr prayer that day, does he complete his fast?

Answer:
No, as long as he drank intentionally after the dawn, his fast is not valid because he was intentional in drinking. The fact that he thought the dawn had not appeared does not benefit him. The criterion is the reality; the criterion is the reality. This is drinking after the dawn has appeared, intentionally drinking; it is not acceptable.