Musnad Ahmad 25:1428

Yazid, meaning Ibn Harun, narrated to us, Al-Hajjaj informed us, from Al-Hasan ibn Sa'd, from Ali ibn Abdullah ibn Abbas, from his father: "That the Messenger of Allah, peace and blessings of Allah be upon him, entered upon Duba'ah bint az-Zubayr. He ate a shoulder of meat at her place, then he went out to the prayer and did not perform ablution."