Musnad Ahmad 32:237

Waki' narrated to us, Hisham and Ishaq al-Azraq narrated to us, they said: al-Dastawa'i informed us, from Yahya ibn Abi Kathir, from Anas ibn Malik, who said: When the Prophet, peace and blessings of Allah be upon him, would break his fast with a household, he would say: "May the fasting ones break their fast with you, may the righteous eat your food, and may the angels descend upon you."