We are now approaching the “White Days” of the blessed month of Dhu’l-Qa`dah. The “White Days” are the days that follow nights in which the moon is full, namely the 13th, 14th and 15th days of each lunar month. The Messenger of Allah ﷺ encouraged his Companions to fast three days in every month and to fast these days specifically. The reward for fasting these days in Dhu’l-Qa`dah will also be multiplied because it is a sacred month.
The Messenger of Allah said ﷺ: “If you fast three days in the month then fast the thirteenth, fourteenth and fifteenth” (Narrated by al-Tirmidhi and al-Nasa’i).
Please check the moon sighting in your locality to be sure that your fast coincides with the “White Days.”