Musnad Ahmad 658:156

Yahya ibn Adam narrated to us, Abu al-Ahwas narrated to us, from Mansur, from al-Sha'bi, from al-Bara' ibn 'Azib, who said: "The Messenger of Allah, peace and blessings of Allah be upon him, delivered a sermon to us on the Day of Sacrifice (Yawm al-Nahr) after the prayer."