Musnad Abu Ya'la al-Mawsili 42:435

Khalf bin Hisham narrated to us, Hammad bin Zaid narrated to us, Bishr bin Harb narrated to us, he said: I heard Abu Sa'id al-Khudri narrating from the Messenger of Allah (may Allah bless him and grant him peace): He forbade *al-wisal* (continuous fasting without breaking it) in fasting. It was said: "O Messenger of Allah, why do you do it?" He said: "I am not like one of you; I am fed and given to drink."