The ruling on fasting a voluntary fast for one who had intercourse with his wife after dawn
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Question:
I say: Honorable Shaykh, may Allah grant you success. A person intended to perform a voluntary fast, and he had not yet drunk or eaten, but he had intercourse with his wife. Is it permissible for him to fast on this day?
Answer:
If he had intercourse with her during the day after the appearance of dawn, no, it is not valid, because he committed an act that breaks the fast after the appearance of dawn. Yes.
I say: Honorable Shaykh, may Allah grant you success. A person intended to perform a voluntary fast, and he had not yet drunk or eaten, but he had intercourse with his wife. Is it permissible for him to fast on this day?
Answer:
If he had intercourse with her during the day after the appearance of dawn, no, it is not valid, because he committed an act that breaks the fast after the appearance of dawn. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، 037 من 123 / شرح كتاب زاد المستقنع / الصيام / صالح الفوزان / الفقه / كبار العلماء — youtube.com (1:04:01)
The Arabic text is a machine transcription of the audio recording.