It is not permissible to fast Friday in voluntary fasting unless one fast Thursday with it or Saturday.

Only when a person fast the fast of Da’wood peace be upon him that one can fast it alone.

What is the ruling of fasting (not in Ramadan) on Fridays?

Fasting | March 30, 2014 5:51 pm
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Pls advise what dates can I fast during the month of hajj, is it 9, 10 & 11 or 1st to 10th. Pls advise.
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Does fasting in the months of shaaban, rajab etc has no special or better rewards than fasting during the remaining months outside of the 5 sacred months?