“The Messenger of Allāh صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ would fast until we thought that he would never break his fast, and he would refrain from fasting until we thought that he would never fast. I never saw the Messenger of Allāh صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ fast an entire month other than [the Blessed month of] Ramadān, and the month in which I saw him fast the most was Sha’bān. He would fast all of Sha’bān or all of it other than a few days.”

Saheeh al-Bukhāri 1969, Saheeh

Saheeh Muslim 1156, Saheeh

Translation: Authentic Quotes

قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ:

مَا رَأَيْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ اسْتَكْمَلَ صِيَامَ شَهْرٍ إِلا رَمَضَانَ وَمَا رَأَيْتُهُ أَكْثَرَ صِيَامًا مِنْهُ فِي شَعْبَانَ، كَانَ يَصُومُ شَعْبَانَ كُلَّهُ كَانَ يَصُومُ شَعْبَانَ إَِلا قَلِيلاً

صحيح البخاري ١٩٦٩ | صحيح