We are now approaching the “White Days” of the month of Sha`ban. The “White Days” are the days which follow nights in which the moon is full, namely the 13th, 14th and 15th days of each lunar month.
The Messenger of Allah (may Allah bless him and grant him peace) encouraged his Companions to fast three days in every month and to fast these days specifically.
We should attempt to fast all three days if we are able, since Sayyidah `A’ishah said of the Prophet (may Allah bless him and grant him peace): “I did not see him fasting in any month more than Sha`ban.” (Narrated by al-Bukhari and Muslim)
If we are unable to do so, we should attempt to fast the fifteenth, since the Messenger of Allah (may Allah bless him and grant him peace) said that when this night comes we should spend it in prayer and fast the following day. Please check the moon sighting in your locality.