Voluntary fasts:
It is recommended to fast alternate days; it is the best kind of fasting which is the fasting of Prophet Daawood (David), peace be upon him, three days of each month, Mondays, Day of ‘Arafah, six days of Shawwaal, and the tenth day of the month of Al-Muharram.
It is forbidden to observe fasting on the day of ‘Eed Al-Fitr and day of ‘Eed Al-Adha, and single out Friday for especial fasting.