I hope you will clarify for us the ruling on fasting on Saturdays for a reason such as the Day of 'Arafah, the white days, or the Day of 'Ashura?
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Question:
He asks and says: I hope the Honorable Shaykh will clarify for us the ruling on fasting on Saturdays for a reason such as the Day of 'Arafah, the white days, or the Day of 'Ashura; because some say it is forbidden to fast on them. We ask for your guidance on this? May Allah reward you with good.
Answer:
Yes, regarding the Day of Saturday, some scholars hold that it is disliked to fast on it if it is singled out for fasting. It is disliked to single it out for fasting. However, if it is fasted along with other days, the dislike is removed. Or if it coincides with the Day of 'Arafah, the dislike is removed by fasting it; because the intention is to fast the Day of 'Arafah, and not to fast Saturday. Those who disliked fasting on Saturday alone opened the door to fasting. The correct view is that there is no dislike in fasting on Saturday. And if it coincides with the Day of 'Arafah, or follows the white days, or is fasted to make up a missed fast, there is no dislike in that according to all scholars, and praise be to Allah.
He asks and says: I hope the Honorable Shaykh will clarify for us the ruling on fasting on Saturdays for a reason such as the Day of 'Arafah, the white days, or the Day of 'Ashura; because some say it is forbidden to fast on them. We ask for your guidance on this? May Allah reward you with good.
Answer:
Yes, regarding the Day of Saturday, some scholars hold that it is disliked to fast on it if it is singled out for fasting. It is disliked to single it out for fasting. However, if it is fasted along with other days, the dislike is removed. Or if it coincides with the Day of 'Arafah, the dislike is removed by fasting it; because the intention is to fast the Day of 'Arafah, and not to fast Saturday. Those who disliked fasting on Saturday alone opened the door to fasting. The correct view is that there is no dislike in fasting on Saturday. And if it coincides with the Day of 'Arafah, or follows the white days, or is fasted to make up a missed fast, there is no dislike in that according to all scholars, and praise be to Allah.
Source
قناة «العلامة الدكتور صالح الفوزان»، أرجو من فضيلتكم أن يبين لنا حكم صيام أيام السبت لسبب مثل يوم عرفة أو الأيام البيض أو يوم عاشوراء؟ — youtube.com
The Arabic text is a machine transcription of the audio recording.