Musnad Ahmad 1153:1989

Yazid narrated to us, he said: Sufyan—meaning Ibn Husayn—informed us, from al-Zuhri, from Urwah, from Aisha, who said: "A sheep was gifted to Hafsa, and we were both fasting. She broke my fast, and she was the daughter of her father. Then the Messenger of Allah, peace and blessings of Allah be upon him, entered upon us, and we mentioned that to him. He said: 'Substitute a day in its place.'"