The White Days of Every Month
The 13th, 14th, and 15th of each lunar month are known as Ayyām al-Bīḍ (the White Days), named so because of the brightness of the full moon during these nights.
The Virtue of Fasting These Days
The Prophet ﷺ encouraged fasting on these blessed days, saying: 'Fasting three days of every month is like fasting for a lifetime' (Bukhari 1979, Muslim 1160). This is because each good deed is rewarded ten times over, so three days become equivalent to thirty days, which over a month equals perpetual fasting.
The Practice of the Prophet ﷺ
Abū Dharr رضي الله عنه reported: 'The Messenger of Allah ﷺ commanded us to fast three days of every month: the 13th, 14th, and 15th' (Nasā'ī 2424, Tirmidhi 761).
Benefits of This Practice:
- Consistent Worship: Maintains spiritual momentum throughout the year, not just during Ramadan
- Self-Discipline: Strengthens willpower and self-restraint on a regular basis
- Abundant Rewards: Achieves the reward of fasting an entire lifetime through consistent practice
- Following the Sunnah: Emulates the beloved practices of the Prophet ﷺ
Reference: https://islamqa.info/en/answers/21775