Musnad Ahmad 30:3563

Rawh narrated to us, Salih narrated to us, Ibn Shihab informed us, from Abu Salamah, from Abu Hurairah, that the Messenger of Allah (ﷺ) forbade *al-wisal* (continuous fasting without breaking it). A man from the Muslims said: "You practice *al-wisal*." He said: "You are not like me; I spend the night while my Lord feeds me and gives me to drink." When they refused to desist from *al-wisal*, he continued the fast with them for a day, then another day. Then the crescent moon was sighted, and he said: "Had it been delayed, I would have increased it for you," as a reprimand to them.