´It was narrated that Rabi’ah bin Ghaz asked ‘Aishah about the fasting of the Messenger of Allah (ﷺ). She said:` “He used to fast all of Sha’ban, until he joined it to Ramadan.”
Hadith Referenceسنن ابن ماجه / كتاب الصيام / 1649
Hadith Gradingالألبانی:حسن صحيح | زبیر علی زئی:إسناده صحيح