Musnad Abu Ya'la al-Mawsili 115:131

Abu Khaythama narrated to us, Yahya narrated to us, from Shu'bah, Qatadah narrated to us, from Anas, that the Prophet (peace be upon him) said: "Do not practice continuous fasting (wisal)." They said: "But you practice continuous fasting." He said: "I am not like one of you; I am fed and given to drink."