Musnad Abu Ya'la al-Mawsili 115:258

Zuhayr narrated to us, Affan narrated to us, Hammam narrated to us, from Qatadah, from Anas, that the Prophet (may Allah bless him and grant him peace) forbade continuous fasting (wisal). It was said to him, "Indeed, you practice continuous fasting." He said, "I spend the night while my Lord feeds me and gives me drink."