Musnad Ahmad 32:1716

'Affan narrated to us, Hammad narrated to us, he said: Thabit informed us, from Anas, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The person who had the most severe trial in the world among the people of Paradise will be brought, and it will be said: 'Dip him one dip in Paradise.' So he will be dipped in it one dip. Then Allah will say to him: 'O son of Adam, have you ever seen any misery, or anything you disliked?' He will say: 'No, by Your Might, I have never seen anything I disliked at all.' Then the person who had the most luxury in the world among the people of Hell will be brought, and it will be said: 'Dip him one dip in it.' Then it will be said: 'O son of Adam, have you ever seen any good, or any delight of the eye at all?' He will say: 'No, by Your Might, I have never seen any good at all, nor any delight of the eye at all.'"