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https://alalbaany.com/2012/10/22/only-fast-friday-combined-with-thursday-but-he-who-unknowingly-fasts-on-friday-alone-is-then-obliged-to-fast-on-saturday-shaikh-al-albaani/
Only fast Friday if combined with Thursday, but he who unknowingly fasts on Friday alone is then obliged to fast on Saturday - Shaikh al-Albaani