Musannaf Ibn Abi Shayba 3:3205

Abu Bakr narrated to us, he said: Hushaym ibn Bashir narrated to us, he said: Muhammad ibn Ishaq informed us, from Hafs ibn Ubayd Allah ibn Anas, from Anas, he said: The Messenger of Allah (peace and blessings of Allah be upon him) used to break his fast on the day of Fitr with some dates, then he would go out [for the prayer].