1. The first and last Thursday of the month, and the first Wednesday that occurs after the tenth of the month. If someone fails to fast on those days, it is recommended that he fast its qaÃÁ. If he is completely unable to fast, it is recommended that he give one mudd of staple food or 12.6 nukhÙd of minted silver to a needy person.
2. The thirteenth, fourteenth and fifteenth of every month.
3. The entire month of Rajab and ShaÞbÁn, or a part of the two months, even if it be for one day.
4. The day of id of Nowruz.
5. The fourth to the ninth of ShawwÁl.
6. The twenty fifth and the twenty ninth day of Dhu al-qa‘dah.
7. The first to the ninth day (the day of ‘Arafah) of Dhu al-Îijjah. However, if owing to weakened state, a person is unable to recite the supplications of the day of ‘Arafah, then it will be makrÙh for him to fast on that day.
8. The felicitous day of ‘Ðd al-ghadÐr, the 18th of Dhu al-Îijjah.
9. The day of MubÁhilah, the 24th of Dhu al-Îijjah.
10. The first, third and seventh day of Muharram.
11. The day of the blessed birth of the holy prophet (May Allah’s Blessings be upon him and his progeny), the 17th of RabÐÞ al-Awwal
12. The 15th day of JamÁdÐ al-ØlÁ.
13. The day of the mab‘ath of the holy prophet (May Allah’s Blessings be upon him and his progeny), the 27th of Rajab.
If someone fasts a recommended fast, it is not obligatory upon him to complete it. In fact, if his brother in faith invites him to a meal, it is recommended that he accept his invitation, and break his fast during the day, even if it be after zuhr.