Musnad Ahmad 32:1346

'Arim narrated to us, Mu'tamir ibn Sulayman narrated to us, he said: And my father said, Anas narrated to us, that the Prophet, peace and blessings of Allah be upon him, said: "I saw Paradise and Hell depicted on this wall, and I have not seen the like of today in terms of good and evil," or as he said.