Al-Imaam An-Nawawi (may Allaah have mercy upon him) stated in Sharh Al-Muhadh-dhab (6/250):
"The Messenger of Allaah (sallallaahu alayhoi wa sallam) fasted in Ramadaan for nine years. That is because fasting in Ramadaan became obligatory in the month of Sha'baan during the second year of Hijrah and the Prophet (sallallaahu alayhi wa sallam) died in the month of Rabee' al-Awwal during the eleventh year of Hijrah."
"The Messenger of Allaah (sallallaahu alayhoi wa sallam) fasted in Ramadaan for nine years. That is because fasting in Ramadaan became obligatory in the month of Sha'baan during the second year of Hijrah and the Prophet (sallallaahu alayhi wa sallam) died in the month of Rabee' al-Awwal during the eleventh year of Hijrah."
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