Fasting six days after Ramadhan is same as a year's fast
It is narrated that, if a person was to fast six days within the month of Shawwal (the month after Ramadhan), then it is as if he fasted for a year.
This is because Allah multiplies a good deed by ten. 30 days fasting during Ramadhan plus 6 days fasting of Shawwal is 36, multiplied by 10 is 360 which is equivalent to a year.
- Abu Ayyoob  reported that the Messenger of Allah  said: "Whoever fasts Ramadaan and follows it with six days of Shawwaal, it will be as if he fasted for a lifetime.”
[Muslim, Abu Dawood, al-Tirmidhi, al-Nisaa’i and Ibn Maajah]
- The Prophet  said: "Whoever fasts for six days after (Eid) al-Fitr has completed the year".
- "Allah has made for each good deed ten like it, so a month is like fasting ten months, and fasting six days (including 30 days of Ramadan) completes the year."
[al-Nisaa’i and Ibn Maajah. Also Saheeh al-Targheeb wa’l-Tarheeb]
- Ibn Khuzaymah with the wording: “Fasting for the month of Ramadaan brings the reward of ten like it, and fasting for six days brings the reward of two months, and that is the fasting of the whole year.
- The Hanbali and Shaafa’i scholars explained that fasting six days of Shawwaal after fasting Ramadaan makes it as if one has fasted for an entire year of obligatory fasts, because the multiplication of the reward applies even to naafil fasts, because each good deed brings the reward of ten like it.