Fasting the month of Sha’bān – A neglected Sunnah
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Narrated Abu Sa`īd (رضي الله عنه ):
I heard the Prophet (ﷺ) saying, "Indeed, anyone who fasts for one day for Allāh's Pleasure, Allāh will keep his face away from the (Hell) fire for (a distance covered by a journey of) seventy years."
[Sahihayn]

‘Ā’ishah (رَضِيَ اللَّهُ عَنْهَا) said:
“The Messenger of Allāh (ﷺ) used to fast all of Sha’bān, he used to fast Sha’bān except a few days.”
[Muslim (1156)]

Al-Nawawī (رحمه الله) said: In the words, “He used to fast all of Sha’bān, he used to fast Sha’bān except a few days” the second phrase explains the first, and indicates that the word “all” means “most of”. 
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Virtuous times like these should be taken advantage of in hastening towards good deeds.
Ibn Hajar (رحمه الله) said: "He (ﷺ) observed more voluntary fasts in Sha’bān than in any other month, and he used to fast most of Sha’bān."

Ibn Rajab (رحمه الله) said: "Fasting in Sha’bān is better than fasting in the Sacred Months, and the best of voluntary fasts are those that are (observed in the months) closest to Ramadān, before or after. The status of these fasts is like that of al-Sunan al-Rawātib which are done before and after Fardh and which make up for any shortfall in the number of obligatory prayers. The same applies to fasts observed before and after Ramadān. Just as al-Sunan Al-Rawātib are better than other kinds of voluntary prayers, so fasts observed before and after Ramadān are better than fasts at other times."

اللَّهمَّ بلَّغْنا رمضانْ