“Beed” is the plural of “Abyad” which means white. Three days of 13, 14 and 15 of lunar month are called “Al-Ayyam-ul-Beed” for the reason that their nights are bright because of the moonlight. The moon begins to diminish gradually after these days.
Abu Hurayrah (radiAllaahu ‘anhu) said: “My close friend [i.e., the Prophet (sallAllaahu ‘alayhi wa sallam)] advised me to do three things which I will never give up until I die: fasting three days each month, praying Duha, and sleeping after praying Witr.” (al-Bukhaari, 1178; Muslim, 721).
The Messenger of Allaah (sallAllaahu ‘alayhi wa sallam) said:
‘Shall I not tell you of something that will take away the evil of the heart? Fasting three days of each month.’ (an-Nisaa’i 2/2386)
and the THIS MONTH THE 13 ,14 AND 15 OF HIJRI CALENDAR
TUESDAY 14 WEDNESDAY 14 AND THURDAY 15 JANNUARY 2014