Sahih Muslim | Book 6 | Hadith Number 2435

Narrated by 'Aisha (Allah be pleased with her)
'Aisha (Allah be pleased with her) said: The Apostle of Allah (may peace be upon him) forbade them (his Companions) to observe Saum Wisal out of mercy for them. They said: You (Holy Prophet) yourself observe it. Upon this he said: I am not like you. My Lord feeds me and provides me drink.