Musnad Abu Ya'la al-Mawsili 2:101

Abu Khaythama narrated to us, Waki' narrated to us, Hisham bin 'Urwah narrated to us, from his father, from 'Asim bin 'Umar, from his father, from the Prophet (peace be upon him), who said: "When the night approaches and the day departs from here, the fasting person has broken his fast."