When is it obligatory to form the intention for fasting an obligatory fast, whether making up a missed fast or performing it in its proper time?
Machine translationRead the Arabic original
Question:
He says: Shaykh, if this questioner intends on Monday, for example, to fast the coming Thursday and Friday to make up missed fasts, is it required for him to form the intention again for each day? And if he forgets, is his fast considered valid?
Answer:
The intention for fasting is formed at the time of fasting. You form the intention at the pre-dawn meal, or you form the intention from the night to fast to make up missed fasts, or to fast a specific number of days. As for voluntary fasting, this is not required. So if you reach the daytime without an intention, but you have not eaten, not drunk, and not consumed anything that breaks the fast, you may form the intention during the day. This is for voluntary fasts. Yes.
He says: Shaykh, if this questioner intends on Monday, for example, to fast the coming Thursday and Friday to make up missed fasts, is it required for him to form the intention again for each day? And if he forgets, is his fast considered valid?
Answer:
The intention for fasting is formed at the time of fasting. You form the intention at the pre-dawn meal, or you form the intention from the night to fast to make up missed fasts, or to fast a specific number of days. As for voluntary fasting, this is not required. So if you reach the daytime without an intention, but you have not eaten, not drunk, and not consumed anything that breaks the fast, you may form the intention during the day. This is for voluntary fasts. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، 7761- متى يجب عقد النية في صيام الفرض قضاء وأداء؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.