Musnad Ahmad 980:11

Abu Nu‘aym narrated to us, Sufyan narrated to us, from Salamah, from a man, from his father—Sufyan said: I think it is ‘Iyad ibn ‘Iyad—from Abu Mas‘ud, who said: The Messenger of Allah (peace and blessings of Allah be upon him) delivered a sermon to us, and he mentioned its meaning.