The Ruling on Singling Out Sunday for Fasting
Machine translationRead the Arabic original
Question:
He says: Honorable Shaykh, may Allah grant you success, is it permissible to fast only on Sunday or only on Monday?
Answer:
There is no prohibition coming from that. There is no prohibition coming from that, except that Sunday is the day of the Christians, the day of the Christians' prayer. So if one intends this, it is not permissible. But if one does not intend to exalt this day as the Christians exalt it, there is nothing wrong with it. Yes.
He says: Honorable Shaykh, may Allah grant you success, is it permissible to fast only on Sunday or only on Monday?
Answer:
There is no prohibition coming from that. There is no prohibition coming from that, except that Sunday is the day of the Christians, the day of the Christians' prayer. So if one intends this, it is not permissible. But if one does not intend to exalt this day as the Christians exalt it, there is nothing wrong with it. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، 141/55 شرح زاد المستقنع/ صالح الفوزان — youtube.com (25:46)
The Arabic text is a machine transcription of the audio recording.