Musnad Ahmad 435:93

Ya'qub narrated to us, my father narrated to me, from his father, he said: Al-Hakam ibn Mina informed me, from Yazid ibn Jariyah, he said: I was in a gathering with Mu'awiyah, among a group of the Ansar, and we were talking, when Mu'awiyah came out to us, and he mentioned its meaning.