Musnad Ahmad 924:6

Ibrahim ibn Khalid narrated to us, Rabah narrated to us, from Ma'mar, from al-Zuhri, Abu Bakr ibn Abd al-Rahman narrated to me, from Marwan ibn al-Hakam, from Abd al-Rahman ibn al-Aswad, from Ubayy ibn Ka'b, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, some poetry is wisdom." Rabah differed from the narration of Ibn al-Mubarak and Abd al-Razzaq, because they both said: "From Urwah." Rabah said: "From Abu Bakr ibn Abd al-Rahman."