It is commendable to keep six fasts during Shawwaal. Rasulullah Salallahu ‘Alayhi Wasallam said:
“Whoever completes the fasts of Ramadhaan and then adds to them the fast of six days during the month of Shawwaal, it will carry the Thawaab of fasting for the entire year.” [Sahih Muslim]
This Hadith has described the great reward of the six fasts during Shawwaal. The scholars have interpreted this Hadith as follows:
According to the rules of Shari’ah, every good deed is rewarded ten times. Therefore, the fast of 30 days carries the reward of 300 days. If the fasts of Ramadhaan were to continue for six additional days, it would carry the reward to 60 days. This means that the total would stand at 360 days of fasting – which is the total number of days in one year according to the Islamic calendar.
Muslims should therefore seize this opportunity of acquiring this enormous reward from Allah Ta’ala. It is not permissible to fast on the day of Eid-ul-Fitr. Therefore it is advisable to start these fasts on the 2nd of Shawwaal and to keep fasting until the 7th of Shawwaal. However, if these fasts should be kept on any other six days of Shawwaal, it is hoped that the above requirement of the above mentioned Hadith may, Insha Allah, also be fulfilled.