Musnad Ahmad 924:4

'Abd al-Razzaq narrated to us, Ma'mar informed us, from al-Zuhri, from 'Urwah, from Marwan ibn al-Hakam, from 'Abd al-Rahman ibn al-Aswad ibn 'Abd Yaghuth, from Ubayy ibn Ka'b, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, and he mentioned the hadith. Ubayy said: "And Ibn al-Mubarak agreed with him," meaning: they both agreed upon 'Urwah, and they did not say: "Abu Bakr ibn 'Abd al-Rahman."