Al-Ayyam al-Bid'(The White days)

The White days, or known as 'Al-Ayyam al-Bid' in Arabic, are the three consecutive days that fall on every 13th, 14th and 15th day of the Islamic month. It is called white days because the full moon shines brightly throughout the 3 mentioned days. Hence, the radiant full moon at night symbolises the White days.

It is recommended to fast three days each month.

Abu Qatada al-Ansari reported that the Messenger of Allah (ﷺ) said:

"Three days' fasting every month and of the whole of Ramadan every year is a perpetual fast."

Sahih Muslim 1162a