"The Messenger of Allah used to fast all of Shaban, and he made sure to fast on Mondays and Thursdays." '
Sunan an-Nasa'i Book 22, Hadith 97
← Previous Hadith 'I said to Aishah: 'did the Messenger of Allah offer Duah prayer?' she said: 'No, unless he was returning from a journey.' I said: 'was the Messenger of Allah known to observe any fast regularly apart from Ramadan?'' She said: 'by Allah, he did not observe any fast regularly apart from amadan until he passed away, and he did not break his fast for a whole month, rather he would fast some of it (each month).""( '

Sunan an-Nasa'i Book 22, Hadith 96 Next Hadith → "The Messenger of Allah used to fast Sha`ban and Ramadan, and he made sure to fast on Mondays and Thursday."

Sunan an-Nasa'i Book 22, Hadith 98