It was narrated from Abu Salamah bin ‘Abdur-Rahman that he asked Aishah (RA) about the fasting of the Messenger of Allah ﷺ ,She said: “The Messenger of Allah ﷺ used to fast until we said: ‘He will not stop fasting,’ and he used not to fast until we said: ‘He will not fast.’ And he used to fast Sha’ban, or most of Sha’ban.” (Sahih)