From Sahih Muslim (Hadith 2564):
Ibn 'Umar reported that the Messenger of Allah (ﷺ) observed fasts uninterruptedly in Ramadan and the people (in his wake) did this. But he forbade them to do so. It was said to him (to the Holy Prophet):You yourself observe the fasts uninterruptedly (but you forbid us to do so) Upon this he said: I am not like you; I am fed and supplied drink (by Allah)
Reference: Muslim 2564