It wasnarrated that Ibn 'Abbas said:
"The Messenger of Allah (ﷺ)usedto fast until we thought he would never stop fasting. And he usedtonot fast until we thought we would never fast. And he never fastedany compelte month apart from Ramadan, from the time he came toAl-Madinah." (FR)
English reference (FR): Vol. 1, Book 7, Hadith 1711 (FR)
Arabic reference (FR): Book 7, Hadith 1782 (FR)