It wasnarrated that Rabi'ah bin Ghaz asked 'Aishah about the fastingofthe Messenger of Allah (ﷺ). She said:
"He used to fast all ofSha'ban, until he joined it to Ramadan." (ES)
English reference (ES): Vol. 1, Book 7, Hadith 1649 (ES)
Arabic reference (ES): Book 7, Hadith 1718 (ES)