Musnad Ahmad 1259:2

Rawh narrated to us, he said: Sa’id narrated to us, from Qatadah, from Salih Abu al-Khalil, from Abdullah ibn al-Harith ibn Nawfal, from Umm Hakim bint al-Zubayr: "That the Messenger of Allah (peace and blessings of Allah be upon him) entered upon her sister, Duba’ah bint al-Zubayr, and he ate from a shoulder [of meat], then he stood for the prayer and did not perform ablution." My father said: And al-Khaffaf said: She is Umm al-Hakam bint al-Zubayr.