What are the days on which fasting is not permissible?
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Question:
The questioner says: Is it permissible to fast on Saturday, Sunday, and Monday as expiation for the imam? What are the days on which fasting is disliked?
Answer:
As for the expiation, he fasts it on any day, whether it is Saturday or not, because no specific days have been designated for it. Allah the Exalted says, "then fasting for three days," and did not specify particular days. As for the fasting that is disliked, they said that it is disliked to fast the month of Rajab alone, to fast Friday alone, and to fast Saturday alone. This is the fasting that is disliked. It is forbidden to fast on the two days of 'Id and the days of Tashriq, except for the sacrifice of Tamattu' or Qiran. It is also forbidden to fast during menstruation and post-natal bleeding.
The questioner says: Is it permissible to fast on Saturday, Sunday, and Monday as expiation for the imam? What are the days on which fasting is disliked?
Answer:
As for the expiation, he fasts it on any day, whether it is Saturday or not, because no specific days have been designated for it. Allah the Exalted says, "then fasting for three days," and did not specify particular days. As for the fasting that is disliked, they said that it is disliked to fast the month of Rajab alone, to fast Friday alone, and to fast Saturday alone. This is the fasting that is disliked. It is forbidden to fast on the two days of 'Id and the days of Tashriq, except for the sacrifice of Tamattu' or Qiran. It is also forbidden to fast during menstruation and post-natal bleeding.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما هي الأيام التي لا يجوز فيها الصيام؟ لمعالي الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.