Musnad Ahmad 924:2

'Abd al-Rahman ibn Mahdi and Abu Kamil narrated to us, they said: Ibrahim ibn Sa'd narrated to us, from al-Zuhri. Abu Kamil said in his narration: Ibn Shihab narrated to us, from Abu Bakr ibn 'Abd al-Rahman, from Marwan ibn al-Hakam, from 'Abd Allah ibn al-Aswad ibn 'Abd Yaghuth, from Ubayy ibn Ka'b: That the Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, some poetry is wisdom." Abu 'Abd al-Rahman said: "This is how Ibrahim ibn Sa'd says in his narration: 'Abd Allah ibn al-Aswad, but it is only 'Abd al-Rahman ibn al-Aswad ibn 'Abd Yaghuth, from Ubayy ibn Ka'b. That is how others besides Ibrahim ibn Sa'd say it."