Musannaf Ibn Abi Shayba 7:425

Waki’ narrated to us, from Sufyan, from Habib ibn Abi Thabit, from ibn al-Mutawwas, from al-Mutawwas, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Whoever breaks his fast for one day of Ramadan without a concession, the fasting of a lifetime will not suffice him."