Is it obligatory to make the intention for voluntary fasting, such as fasting on the Day of 'Arafah or the Day of 'Ashura, during the night?
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Question:
May Allah reward you, Honorable Shaykh. This questioner says: In voluntary fasting, such as fasting on the Day of 'Arafah or the Day of 'Ashura, is it necessary to make the intention during the night, or is there no harm in not making it during the night?
Answer:
For all voluntary fasting, it is not obligatory to make the intention during the night. So if a person reaches the morning without having eaten or drunk, and then makes the intention to fast during the day, that is permissible in voluntary fasting. Yes.
May Allah reward you, Honorable Shaykh. This questioner says: In voluntary fasting, such as fasting on the Day of 'Arafah or the Day of 'Ashura, is it necessary to make the intention during the night, or is there no harm in not making it during the night?
Answer:
For all voluntary fasting, it is not obligatory to make the intention during the night. So if a person reaches the morning without having eaten or drunk, and then makes the intention to fast during the day, that is permissible in voluntary fasting. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، [685 -954] هل يجب تبييت النية في صيام النافلة كصيام يوم عرفة أو يوم عاشوراء؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.