Musnad Ahmad 30:1781

Aswad ibn Amir narrated to us, he said: Abu Bakr informed us, from Asim, from Abu Salih, from Abu Hurairah, who said: The Messenger of Allah, peace and blessings of Allah be upon him, forbade *al-wisal* (fasting continuously without breaking the fast). It was said: O Messenger of Allah, you practice *al-wisal*. He said: "I am not like you; I remain with my Lord, He feeds me and He gives me drink."