Musnad Ahmad 30:3849

Hussain ibn Muhammad narrated to us, Ibn Abi al-Zinad narrated to us, from his father, from al-A’raj, from Abu Hurairah, who said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "No one shall enter the Fire except that he is shown his seat in Paradise, had he done good, so that it may be a source of regret for him. And no one shall enter Paradise except that he is shown his seat in the Fire, had he done evil, so that he may increase in gratitude."