Musnad Abu Ya'la al-Mawsili 139:23

Suwayd ibn Sa'id narrated to us, Mu'tamir ibn Sulayman narrated to us, from his father, from Anas ibn Malik, from the Prophet (peace and blessings of Allah be upon him), who said: "I saw Paradise and Hell in this wall, and I have not seen the like of today in terms of good and evil."