Musnad Ahmad 32:382

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: I heard Qatadah saying: Anas ibn Malik narrated to us, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "I and the Hour have been sent like these two." Shu'bah said: And I heard Qatadah saying in his stories: "Like the precedence of one of them over the other." I do not know if he mentioned it from Anas, or if Qatadah said it himself.