Musnad Abu Ya'la al-Mawsili 42:202

On the authority of Abu Sa'id, he said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "When the people of Paradise enter Paradise and the people of the Fire enter the Fire, it will be said: 'O people of Paradise!' They will stretch their necks and look. Then death will be brought as if it were a speckled ram. It will be said to them: 'Do you recognize this death?' They will say: 'It is he,' and all of them will have recognized it. Then it will be brought forward and slaughtered. Then it will be said to them: 'O people of Paradise, eternity, no death! And O people of the Fire, eternity, no death!' He said: That is His saying: 'And warn them, [O Muhammad], of the Day of Regret, when the matter will be concluded; and [yet] they are in [a state of] heedlessness, and they do not believe.'"