Rajab and Sha’ban

In Rajab and Sha’ban one should either fast:

a)      every Monday and Thursday.

Or:

b)       every day. 

In Muslim, Abu Dawud, and Ahmad: ‘Uthman ibn Hakim al-Ansari said; asked Sa’id ibn Jubayr about fasting in Rajab, and were then passing through the month of Rajab, whereupon he said: I heard Ibn’ Abbas saying” “The Emissary of Allah used to observe fast so continuously that we thought he would never break it, and at other times he remained without fasting so continuously that we thought he would never fast.” 

Of one is fasting every Monday and Thursday then one should include fasting not eh 15^th of each month and the 26^th and 27^th of Rajab. (It is praiseworthy to fast the tree “white” days of each month. These being the 13^th, 14^th and 15^th) These are only general guidelines. When in doubt, consult with someone versed in Shari’ah.