Uthman ibn Hakim al-Ansari said: I asked Sa`id ibn Jubayr about fasting in Rajab, and we were then passing through the month of Rajab, whereupon he said: I heard Ibn `Abbas saying:
“The Messenger of Allah (may Allah bless him and grant him peace) used to observe fast so continuously that we thought he would not break it, and did not observe it so continuously that we thought he would not observe fast.”
[Sahih Muslim]
Imam Nawawi commented on this in Sharh Sahih Muslim:
“It would appear that the meaning inferred by Sa`id ibn Jubayr from Ibn `Abbas’ report is that fasting in Rajab is neither forbidden nor considered praiseworthy in itself, rather, the ruling concerning it is the same as the rest of the months.”
Imam Nawawi continues:
“Neither prohibition nor praiseworthiness has been established for the month of Rajab in itself, however, the principle concerning fasting is that it is praiseworthy in itself, and in the Sunan of Abu Dawud the Prophet (s) has made the fasting of the sacred months praiseworthy, and Rajab is one of them.”
Source: http://sunnah.org/nl/v0102/rajab.html
Was Salam
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Jazakallahu Khairan for your fantastic post. May Allah Bless You Akhi…Ameen.