The reward of fasting the White Days

Equal to fasting a year

Three days × 12 months = 36 days. Multiplied tenfold = 360, equal to a full lunar year of fasting.

The Prophet’s ﷺ explanation

The Prophet ﷺ told ʿAbdullāh ibn ʿAmr: “Fast three days of every month, for every good deed is rewarded tenfold — that is like fasting for a lifetime.” ^[1]Muslim

Hadith confirmation

Multiple hadith confirm that fasting three days a month equals a year in reward. Some specify the White Days, while others leave it general.

Conclusion

By fasting only three days each month, you can gain the reward of an entire year of fasting. Read more here.