He was asked about the hadith: “Do not fast on Friday unless you fast the day before it or the day after it.”
Machine translationRead the Arabic original
The questioner : Sunan Ibn Majah 1726Hasan (Darussalam) It is known that it is not permissible to fast on Saturday, even if it is the Day of 'Arafah. Is it not obligatory to fast the day after Friday if one did not fast on Thursday?
The Shaykh : There is a distinction here. If one fasts on Friday and does not know that it is not permissible to fast it alone,
The questioner : Yes.
The Shaykh : then this is fasting on Saturday, because fasting on that day is obligatory in this case. As for the one who knows, it is not permissible for him to fast on Friday unless he has preceded it by fasting on Thursday.
Do not fast on Saturdays apart from days when you are obliged to fast
لا تصوموا السبت إلا فيما افترض عليكمThe Shaykh : There is a distinction here. If one fasts on Friday and does not know that it is not permissible to fast it alone,
The questioner : Yes.
The Shaykh : then this is fasting on Saturday, because fasting on that day is obligatory in this case. As for the one who knows, it is not permissible for him to fast on Friday unless he has preceded it by fasting on Thursday.
Source
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The Arabic text is copied verbatim from the original source, without any edits.