What is the ruling on fasting on Saturday if it coincides with days on which fasting is recommended?
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Question : The questioner says: Honorable Shaykh, what is the ruling on fasting on Saturday if it coincides with the days on which fasting is recommended?
Answer : There is nothing wrong with fasting on Saturday, and there is nothing wrong with fasting on Friday if it coincides with the days on which fasting is prescribed, just as if Friday coincided with the white days or if Saturday coincided with the white days, there is nothing wrong with it. However, singling out Friday for fasting specifically because it is Friday is what the Prophet (peace and blessings be upon him) forbade, saying:As-Sunan al-Kubra lil-Nasa'i 13:343 and not its night by standing in prayer. Likewise, Saturday is even more so, because it is less significant than Friday. Yes.
Answer : There is nothing wrong with fasting on Saturday, and there is nothing wrong with fasting on Friday if it coincides with the days on which fasting is prescribed, just as if Friday coincided with the white days or if Saturday coincided with the white days, there is nothing wrong with it. However, singling out Friday for fasting specifically because it is Friday is what the Prophet (peace and blessings be upon him) forbade, saying:
Do not single out Friday for fasting
لا تخص يوم الجمعة بصيام
Source
دروس وفتاوى المسجد الحرام لعام 1412 هـ - 2 — binothaimeen.net (1:22:51)
The Arabic text is a machine transcription of the audio recording.