Is it true that it’s undesirable to fast on Fridays, and if one fasts he/she break it, if one completes it should that person fast the next day?
In hadith there is a warning about fasting strictly on Fridays. Hence, it’s undesirable to fast only on Fridays, and if one is fasting he/she doesn’t have to break the fast. Also, if one fasts on Friday that person doesn’t have to fast on the next day.
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