Musnad Abu Ya'la al-Mawsili 175:2

'Amr ibn al-Dahhak narrated to us, my father narrated to us, Talib ibn Salama ibn 'Asim ibn al-Hakam narrated to us, he said: Some of our family narrated to me that he heard my grandfather say: The Messenger of Allah (peace and blessings of Allah be upon him) said on that day: "Behold, Allah looked at this gathering, so He accepted from their doer of good, and He allowed their doer of good to intercede for their doer of evil, so He pardoned them all."